LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 1990 >> M30 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Retrieving Codes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.

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.