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Infiniti M30 1990 – 1990 91 ENGINE PERFORMANCE Self Diagnostics M30

Infiniti M30 1990 - 1990-91 ENGINE PERFORMANCE Self-Diagnostics - M30


Infiniti M30 1990 - INTRODUCTION

If no faults were found while performing BASIC TESTING , proceed with ENTERING SELF-DIAGNOSTICS. If no fault codes or only pass codes are present, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).


Infiniti M30 1990 - SELF-DIAGNOSTIC SYSTEM


The self-diagnostic system is used for diagnosing malfunctions of Electronic Concentrated Control System (ECCS) sensors and actuators. The Electronic Control Unit (ECU) has 2 available diagnostic modes. Before entering self-diagnostics, perform BASIC TESTING . This eliminates wasted diagnostic time and invalid diagnostic results.

NOTE: When performing BASIC TESTING , be careful not to erase any diagnostic information stored in ECU memory.


Infiniti M30 1990 - HARD FAILURES


Hard failures will cause CHECK ENGINE light to illuminate and remain on until problem is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. If a sensor fails, control unit will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, the vehicle runs but driveability will not be optimum.


Infiniti M30 1990 - INTERMITTENT FAILURES


Intermittent failures may cause CHECK ENGINE light to flicker or illuminate and go out after the intermittent fault goes away. However, the corresponding trouble code will be stored in ECU memory. Not all trouble codes will illuminate CHECK ENGINE light. If related fault does not reoccur within a certain time frame, related trouble code will be erased from ECU memory. Intermittent failures may be caused by a sensor, connector or wiring related problems. See INTERMITTENTS in TESTS W/O CODES article in the ENGINE PERFORMANCE Section.

NOTE: Follow proper diagnostic routine when diagnosing the system. See DIAGNOSTIC ROUTINE table.


Infiniti M30 1990 DIAGNOSTIC ROUTINE

Procedure Order
Basic Diagnostic Procedures 1st
Entering Diagnostics 2nd
Retrieving Trouble Codes 3rd
Symptoms (1) 4th
Intermittents (1) 5th
(1) Symptoms and intermittents are covered in TESTS W/O CODES article in the ENGINE PERFORMANCE Section.


Infiniti M30 1990 - CHECK ENGINE LIGHT


NOTE: All trouble codes do not activate CHECK ENGINE LIGHT.

All models are equipped with a CHECK ENGINE light. As a bulb check, light will illuminate when the ignition is turned on and engine is not running.

On California models, CHECK ENGINE light illuminates when a fault is detected with engine running. A corresponding trouble code will set in ECU memory. CHECK ENGINE light also illuminates if ECU or crank angle sensor malfunctions.

On Federal models, CHECK ENGINE light illuminates only when ECU or crank angle sensor malfunctions with engine running.


Infiniti M30 1990 - DIAGNOSTIC MODES


The self-diagnostic system can detect ECCS malfunctions and store related trouble code. Intermittent codes are also stored. All codes are stored until cleared from memory. If an intermittent does not reoccur within 50 ignition key cycles, it will be cleared from memory.

Switching modes is not possible when the engine is running. During diagnosis, the self-diagnostic system will automatically return to Mode I from Mode II when the ignition switch is turned off.


Infiniti M30 1990 - MODE I


This is normal operating mode. In this mode, the CHECK ENGINE light and Red Light Emitting Diode (LED) inspection light in ECU stay on when the ignition is turned on, engine off (bulb check). If the engine is started, CHECK ENGINE light and Red LED in ECU should turn off, unless a fault or trouble code is present (Calif. models) or if the ECU or crank angle sensor is malfunctioning (Calif. and Fed. models).


Infiniti M30 1990 - MODE II


NOTE: Code 55 indicates that there is no malfunction and the system is OK.

This is self-diagnostic mode for retrieving fault or trouble code(s). See RETRIEVING CODES. With the engine running, Mode II can monitor air/fuel mixture feedback control. The CHECK ENGINE light and Red LED in the ECU will flash on (lean) and off (rich) more than 5 times every 10 seconds with engine speed at 2000 RPM when system is in closed loop. The CHECK ENGINE light and Red LED do not flash remain on or off if system is in open loop.


Infiniti M30 1990 - ECU LOCATION


The ECU is located behind the right kick panel.


Infiniti M30 1990 - ENTERING SELF-DIAGNOSTICS


  1. Turn ignition on, but leave engine off. Using a small screwdriver, turn diagnostic mode selector on ECU fully clockwise. Wait at least 2 seconds and then turn diagnostic mode selector fully counterclockwise. Mode II self-diagnostic will result and the CHECK ENGINE light and the Red LED inspection light will flash trouble codes (if present).
  2. If engine is started at this stage, the CHECK ENGINE light and the Red LED inspection light will display the condition of the air/fuel mixture which is monitored by the O2 sensor or if the system is in closed or open loop.

Infiniti M30 1990 - RETRIEVING CODES


NOTE: Mode II can retrieve trouble code(s) from self-diagnostic system.

Read trouble codes with either CHECK ENGINE light or Red LED inspection light on ECU. Trouble codes will flash after selecting Mode II.

Trouble codes are indicated by the number of flashes from CHECK ENGINE light or Red LED inspection light. Count the flashes. For example, 3 long (.6 second) flashes followed by 2 short (.3 second) flashes of CHECK ENGINE light or Red LED indicate a Code 32.


Infiniti M30 1990 TROUBLE CODE IDENTIFICATION

Code System Affected Probable Cause
11 (1) Crank Angle Sensor (2) No crank signal
12 Airflow Meter Circuit Open/shorted circuit
13 Coolant Temp. Sensor Open/shorted circuit
14 Vehicle Speed Sensor (VSS) No VSS signal
21 (1) Ign. Signal Circuit (2) Open/shorted circuit
22 (1) Fuel Pump Circuit Open/shorted circuit
31 ECU Signals not normal
32 EGR Function (Calif.) No EGR action
33 O2 Sensor Open ckt/high O2 signal
34 (1) Knock Sensor Open/shorted ckt
35 EGR Temp. Sensor (Calif.) Open/shorted ckt
42 Fuel Temp. Sensor Open/shorted ckt
43 Throttle Sensor Open/shorted ckt
45 Injector Leak (Calif.) Leak at injector(s)
51 Injector Circuit (Calif.) Injector doesn't work
55 System Ok No Malfunction
(1) These trouble code(s) not will activate CHECK ENGINE light.
(2) Check items causing a malfunction of crank angle sensor circuit first, if Codes 11 and 21 are present at same time.


Infiniti M30 1990 - CLEARING CODES


NOTE: Ensure all diagnostic codes are accessed from ECU memory before disconnecting battery or switching from Mode II to Mode I.


Infiniti M30 1990 - MEMORY ERASE


Stored memory can be erased by disconnecting battery or selecting Mode I after Mode II has been accessed.


Infiniti M30 1990 - SUMMARY


If no hard fault codes (or only pass codes) are present, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.) or intermittent diagnosis procedures.

Infiniti M30 1990 - Component Locations -  Identifying Trouble Code Chart Symbols https://portal-diagnostov.com/license.html
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Fig. 1: Infiniti M30 1990 - Component Locations - Identifying Trouble Code Chart Symbols


Infiniti M30 1990 - DIAGNOSTIC CODE CHARTS


NOTE: Most code charts shown include procedures using Nissan's CONSULT TESTER. If CONSULT TESTER (J-38465 ) is not available, disregard steps using CONSULT tester and use alternate test procedure. (OK = Okay, NG = No Good).


Infiniti M30 1990 - CODE 11: CRANK ANGLE SENSOR


Infiniti M30 1990 - Component Locations -  Code 11: Crank Angle Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 2: Infiniti M30 1990 - Component Locations - Code 11: Crank Angle Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 11: Crank Angle Sensor & ECU Harness Location https://portal-diagnostov.com/license.html
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Fig. 3: Infiniti M30 1990 - Component Locations - Code 11: Crank Angle Sensor & ECU Harness Location

Infiniti M30 1990 - Component Locations -  Code 11: Crank Angle Sensor Flow Chart https://portal-diagnostov.com/license.html
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Fig. 4: Infiniti M30 1990 - Component Locations - Code 11: Crank Angle Sensor Flow Chart


Infiniti M30 1990 - CODE 12: AIRFLOW METER


Infiniti M30 1990 - Component Locations -  Code 12: Air Flow Meter Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 5: Infiniti M30 1990 - Component Locations - Code 12: Air Flow Meter Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 12: Air Flow Meter & ECU Harness Location https://portal-diagnostov.com/license.html
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Fig. 6: Infiniti M30 1990 - Component Locations - Code 12: Air Flow Meter & ECU Harness Location

Infiniti M30 1990 - Component Locations -  Code 12: Air Flow Meter Flow Chart https://portal-diagnostov.com/license.html
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Fig. 7: Infiniti M30 1990 - Component Locations - Code 12: Air Flow Meter Flow Chart


Infiniti M30 1990 - CODE 13: ENGINE (COOLANT) TEMP SENSOR


Infiniti M30 1990 - Component Locations -  Code 13: Engine Temp Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 8: Infiniti M30 1990 - Component Locations - Code 13: Engine Temp Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 13: Engine Temp Sensor & ECU Harness Location https://portal-diagnostov.com/license.html
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Fig. 9: Infiniti M30 1990 - Component Locations - Code 13: Engine Temp Sensor & ECU Harness Location

Infiniti M30 1990 - Component Locations -  Code 13: Engine Temp Sensor Flow Chart https://portal-diagnostov.com/license.html
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Fig. 10: Infiniti M30 1990 - Component Locations - Code 13: Engine Temp Sensor Flow Chart


Infiniti M30 1990 - CODE 14: VEHICLE SPEED SENSOR


Infiniti M30 1990 - Component Locations -  Code 14: Vehicle Speed Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 11: Infiniti M30 1990 - Component Locations - Code 14: Vehicle Speed Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 14: ECU Harness Location https://portal-diagnostov.com/license.html
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Fig. 12: Infiniti M30 1990 - Component Locations - Code 14: ECU Harness Location

Infiniti M30 1990 - Component Locations -  Code 14: Vehicle Speed Sensor Flow Chart https://portal-diagnostov.com/license.html
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Fig. 13: Infiniti M30 1990 - Component Locations - Code 14: Vehicle Speed Sensor Flow Chart


Infiniti M30 1990 - CODE 21: IGNITION SIGNAL CIRCUIT


Infiniti M30 1990 - Component Locations -  Code 21: Ignition Signal Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 14: Infiniti M30 1990 - Component Locations - Code 21: Ignition Signal Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 21: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 15: Infiniti M30 1990 - Component Locations - Code 21: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 21: Ignition Signal Flow Chart https://portal-diagnostov.com/license.html
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Fig. 16: Infiniti M30 1990 - Component Locations - Code 21: Ignition Signal Flow Chart


Infiniti M30 1990 - CODE 22: FUEL PUMP


Infiniti M30 1990 - Component Locations -  Code 22: Fuel Pump Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 17: Infiniti M30 1990 - Component Locations - Code 22: Fuel Pump Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 22: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 18: Infiniti M30 1990 - Component Locations - Code 22: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 22: Fuel Pump Flow Chart https://portal-diagnostov.com/license.html
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Fig. 19: Infiniti M30 1990 - Component Locations - Code 22: Fuel Pump Flow Chart


Infiniti M30 1990 - CODE 31: ENGINE CONTROL UNIT (ECU)


Infiniti M30 1990 - Component Locations -  Code 31: Engine Control Unit (ECU) Flow Chart https://portal-diagnostov.com/license.html
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Fig. 20: Infiniti M30 1990 - Component Locations - Code 31: Engine Control Unit (ECU) Flow Chart


Infiniti M30 1990 - CODE 32: EGR SENSOR


Infiniti M30 1990 - Component Locations -  Code 32: EGR Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 21: Infiniti M30 1990 - Component Locations - Code 32: EGR Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 32: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 22: Infiniti M30 1990 - Component Locations - Code 32: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 32: EGR Sensor Flow Chart (1 of 3) https://portal-diagnostov.com/license.html
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Fig. 23: Infiniti M30 1990 - Component Locations - Code 32: EGR Sensor Flow Chart (1 of 3)

Infiniti M30 1990 - Component Locations -  Code 32: EGR Sensor Flow Chart (2 of 3) https://portal-diagnostov.com/license.html
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Fig. 24: Infiniti M30 1990 - Component Locations - Code 32: EGR Sensor Flow Chart (2 of 3)

Infiniti M30 1990 - Component Locations -  Code 32: EGR Sensor Flow Chart (3 of 3) https://portal-diagnostov.com/license.html
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Fig. 25: Infiniti M30 1990 - Component Locations - Code 32: EGR Sensor Flow Chart (3 of 3)


Infiniti M30 1990 - CODE 33: OXYGEN SENSOR


Infiniti M30 1990 - Component Locations -  Code 33: O2 Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 26: Infiniti M30 1990 - Component Locations - Code 33: O2 Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 33: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 27: Infiniti M30 1990 - Component Locations - Code 33: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 33: O2 Sensor Flow Chart (1 of 2) https://portal-diagnostov.com/license.html
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Fig. 28: Infiniti M30 1990 - Component Locations - Code 33: O2 Sensor Flow Chart (1 of 2)

Infiniti M30 1990 - Component Locations -  Code 33: O2 Sensor Flow Chart (2 of 2) https://portal-diagnostov.com/license.html
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Fig. 29: Infiniti M30 1990 - Component Locations - Code 33: O2 Sensor Flow Chart (2 of 2)


Infiniti M30 1990 - CODE 34: KNOCK (DETONATION) SENSOR


Infiniti M30 1990 - Component Locations -  Code 34: Knock Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 30: Infiniti M30 1990 - Component Locations - Code 34: Knock Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 34: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 31: Infiniti M30 1990 - Component Locations - Code 34: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 34: Knock Sensor Flow Chart https://portal-diagnostov.com/license.html
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Fig. 32: Infiniti M30 1990 - Component Locations - Code 34: Knock Sensor Flow Chart


Infiniti M30 1990 - CODE 35: EGR TEMPERATURE SENSOR


Infiniti M30 1990 - Component Locations -  Code 35: EGR Temp Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 33: Infiniti M30 1990 - Component Locations - Code 35: EGR Temp Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 35: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 34: Infiniti M30 1990 - Component Locations - Code 35: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 35: EGR Temp Sensor Flow Chart https://portal-diagnostov.com/license.html
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Fig. 35: Infiniti M30 1990 - Component Locations - Code 35: EGR Temp Sensor Flow Chart


Infiniti M30 1990 - CODE 42: FUEL TEMPERATURE SENSOR


Infiniti M30 1990 - Component Locations -  Code 42: Fuel Temp Sensor Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 36: Infiniti M30 1990 - Component Locations - Code 42: Fuel Temp Sensor Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 42: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 37: Infiniti M30 1990 - Component Locations - Code 42: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 42: Fuel Temp Sensor Flow Chart https://portal-diagnostov.com/license.html
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Fig. 38: Infiniti M30 1990 - Component Locations - Code 42: Fuel Temp Sensor Flow Chart


Infiniti M30 1990 - CODE 43: THROTTLE POSITION SENSOR


Infiniti M30 1990 - Component Locations -  Code 43: TPS Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 39: Infiniti M30 1990 - Component Locations - Code 43: TPS Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 43: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 40: Infiniti M30 1990 - Component Locations - Code 43: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 43: TPS Flow Chart https://portal-diagnostov.com/license.html
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Fig. 41: Infiniti M30 1990 - Component Locations - Code 43: TPS Flow Chart


Infiniti M30 1990 - CODE 45: INJECTOR LEAK


Infiniti M30 1990 - Component Locations -  Code 45: Injector Leak Flow Chart (1 of 2) https://portal-diagnostov.com/license.html
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Fig. 42: Infiniti M30 1990 - Component Locations - Code 45: Injector Leak Flow Chart (1 of 2)

Infiniti M30 1990 - Component Locations -  Code 45: Injector Leak Final Check Flow Chart (2 of 2) https://portal-diagnostov.com/license.html
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Fig. 43: Infiniti M30 1990 - Component Locations - Code 45: Injector Leak Final Check Flow Chart (2 of 2)


Infiniti M30 1990 - CODE 51: INJECTOR CIRCUIT


Infiniti M30 1990 - Component Locations -  Code 51: Injector Circuit Diagram https://portal-diagnostov.com/license.html
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Fig. 44: Infiniti M30 1990 - Component Locations - Code 51: Injector Circuit Diagram

Infiniti M30 1990 - Component Locations -  Code 51: Component Harness Connector Locations https://portal-diagnostov.com/license.html
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Fig. 45: Infiniti M30 1990 - Component Locations - Code 51: Component Harness Connector Locations

Infiniti M30 1990 - Component Locations -  Code 51: Injector Flow Chart https://portal-diagnostov.com/license.html
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Fig. 46: Infiniti M30 1990 - Component Locations - Code 51: Injector Flow Chart


Infiniti M30 1990 - CODE 55: NO MALFUNCTION


Code 55 indicates that the system is OK. There is no malfunction.