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
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