Diagnostic Code |
Diagnostic Item |
Possible Fault |
12 |
Normal |
No fault or fault in not monitored circuit |
13 |
O2 Sensor |
ECU will drive mixture rich or lean.
If O2 reading doesn't change or is slow to change a fault is flagged |
13 |
Barometric Sensor |
Barometric sensor reading High or Low (Diesel) |
14 |
Water Temperature Sensor |
WTS signal High
Open circuit sensor or bad ground |
14 |
Needle Movement Sensor |
Needle Movement Sensor High or Low (Diesdel) |
15 |
Water Temperature Sensor |
WTS signal Low
Short circuit in sensor or wiring shorted to ground |
21 |
Throttle Position Sensor |
TPS signal High
TPS faulty or open circuit signal or ground connection |
22 |
Throttle Position Sensor |
TPS signal Low
TPS faulty, short circuit signal or open circuit power connection |
23 |
Air Temperature Sensor |
ATS signal High
ATS open circuit or bad ground |
24 |
Vehicle Speed Sensor |
VSS faulty, Broken Speedo cable |
25 |
Air Temperature Sensor |
ATS signal Low
ATS short circuit, signal wire short circuit or open circuit power connection |
26 |
O2 Sensor (Right bank) |
V6 engines only
If O2 reading doesn't change or is slow to change a fault is flagged |
27 |
Compensation Resistance Signal
(Diesel only?) |
Open circuit or shorted |
28 |
Glow Plug Relay Signal
(Diesel only) |
Open circuit or shorted |
31 |
Manifold Pressure Sensor |
MPS signal Low
MPS faulty, open circuit power connection |
31 |
Boost Sensor Signal
(Turbo) |
Boost sensor Signal Low
Boost sensor faulty, open circuit power connection |
32 |
Manifold Pressure Sensor |
MPS signal Low
MPS faulty, open circuit power connection |
32 |
Boost Sensor Signal
(Turbo) |
Boost sensor Signal High
Boost sensor faulty, open circuit ground connection |
33 |
Volume Airflow Sensor |
Volume Airflow Sensor too High or too Low
Airflow sensor faulty or faulty wiring |
33 |
Mass Airflow Sensor |
MAF Signal High
MAF faulty or bad ground connection |
34 |
Mass Airflow Sensor |
MAF Signal Low
MAF faulty or bad power or signal connection |
35 |
NE Sensor
(Diesel only) |
|
37 |
ABS |
ABS malfunction - does not set MIL! |
41 |
Ignition Fail Safe Signal |
Bad connection to noise suppressor, bad noise suppressor |
41 |
Timer Control Valve Signal
(Diesel only) |
|
42 |
Crank Angle Sensor |
CAS signal not present during cranking, only shows while cranking!
Faulty CAS or bad connection |
43 |
Knock Sensor circuit malfunction |
Faulty Knock Sensor or bad connection |
43 |
Starter Signal
(Diesel only?) |
Starter signal on during engine running
Starter signal off during cranking |
44 |
Idle switch |
Idle Switch Open
Faulty Idle switch, badly adjusted TPS, open circuit signal or ground connection |
45 |
Idle Switch |
Idle Switch Closed
Faulty Idle Switch, badly adjusted TPS or signal shorted to ground |
46 |
IAC Valve |
|
47 |
CMP Sensor |
camshaft Position Sensor |
51 |
Exhaust Gas Recirc Valve |
EGR modulator faulty, exhaust passageway clogged, bad VSV, vacuum leak, catalytic converter fault |
52 |
Fuelling Fault |
Bad injector, dirty injector, excessive fuel pressure |
52 |
Spill Valve Signal
(Diesel) |
Stuck spill valve, open or shorted wiring |
53 |
Ground Circuit Error |
California ECU in non-Calif vehicle. Non-Calif ECU in Calif. vehicle |
54 |
5th Gear Switch |
|
61 |
Shift Solenoid Valve A (#1)
(A/T) |
|
62 |
Shift Solenoid Valve A (#1)
(A/T) |
|
63 |
Shift Solenoid Valve B (#2)
(A/T) |
|
64 |
Shift Solenoid Valve B (#2)
(A/T) |
|
65 |
TCC Solenoid Valve Electrical
(A/T) |
|
66 |
TCC Solenoid Valve Electrical
(A/T) |
|
71 |
Test Switch |
Test Switch Terminal Grounded (Samurai only?)
Wire link still in diagnostic plug or signal shorted to ground |
71 |
Memory Error
(Late models) |
ECU internal write error or checksum error |
72 |
Transmission Range Switch circuit malfunction
(A/T) |
|
73 |
Fuel Temperature Sensor
(Diesel) |
Fuel temp. sensor, open or shorted wiring |
75 |
Output Speed sensor Circuit Malfunction
(A/T) |
|
76 |
Input/turbine Speed sensor Malfunction
(A/T) |
|
ON - Not Flashing |
ECU |
ECU Failed |
Immobiliser |
81 |
Immobiliser/ECU |
Immobiliser codes not matched (ECU side) |
82 |
ECU |
ECU Internal fault |
83 |
Immobiliser/ECU |
Serial Data Link |
84 |
ECU |
No Immobiliser codes registered in ECU |