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HOLDEN COMMODORE VN VG VQ & GRP A 5.0L V8 (VU Eng) 1989 – 91 Engine Management System

Fault Codes

System malfunctions fall into Two Categories.

1. Hard Faults.

These are indicated by the Check Engine Light (CEL) being illuminated; Whenever the Engine is Running.

2. Intermittent Faults.

These cause the CEL to be illuminated while the Fault is Present.

The CEL will go out approximately Ten Seconds after the Fault Disappears.

Faults of Either Type will cause a Fault Code to be stored in Memory.

Fault Codes will be displayed on the Check Engine Light.
All Codes consist of Two Digits.

If No Fault Codes are stored in Memory;

A Code 12 will be displayed.

This consists of;

One Flash of the CEL

Followed by a 1.2 Second Pause

Two Flashes of the CEL

Followed by a Longer Pause.

The Code is Repeated.

This Sequence will continue;


Fault Code Table

Code # Circuit and Status
12 No Fault Present
13 Oxygen Voltage not Changing
14 Engine Coolant Temp Sensor Voltage Low
15 Engine Coolant Temp Sensor Voltage High
16 Engine Coolant Temperature
1993 - ON
Signal Voltage Unstable
17 ECM Error
1993 - ON
Coolant Circuit
19 Throttle Position Sensor Stuck
1993 - ON
21 TPS Voltage High
22 TPS Voltage Low
23 Manifold Air Temp Sensor Voltage High
24 Vehicle Speed Sensor Fault
25 Manifold Air Temp Sensor Voltage Low
26 Intake Air Temperature
1993 - ON
Signal Voltage Unstable
31 Theft Deterrant Signal Missing
1993 - ON
(Where Fitted)
33 MAP Sensor Voltage too High
34 MAP Sensor Voltage too Low
35 Idle Speed Error
1993 - ON
36 Vacuum Leak
1993 - ON
41 No Crankshaft Reference while Cranking
42 EST Circuit Fault
43 Knock Sensor Open or Shorted
44 Oxygen Sensor Voltage Low
(Lean)
45 Oxygen Sensor Voltage High
(Rich)
46 No Reference Pulses while Cranking
1993 – ON
51 Memcal Error
54 System Voltage Unstable
1993 - ON
55 Analogue to Digital Error
56 Running Lean under Load
1993 – ON



Hope this helps!