Isuzu Trouble codes
| 12 | No tach signal to ECM – No Distributor Reference Pulses{4} |
| 13 | Oxygen sensor or circuit |
14 | Coolant Temperature Sensor Circuit |
High Coolant Temperature{5} | |
14A | High Coolant Temperature{6} |
14B | Low Coolant Temperature{6} |
15 | Coolant Temperature Sensor Circuit |
Low Coolant Temperature{5}{7} | |
| 16 | Same as 15 |
21 | TP Sensor And/Or Idle Switch |
MAP Sensor{1} | |
TP Sensor, Voltage High{5}{7} | |
| Throttle valve switch/Wide Open Throttle (WOT) position sensor, 1989 Manifold Absolute Pressure (MAP) circuit failure | |
| Throttle Position Sensor (TPS) – V6 models | |
21A | TP Sensor, Voltage High{6} |
21B | TP Sensor, Voltage Low{6} |
| 22 | Starter signal system/1988 and 1989 fuel cut solenoid circuit failure |
TP Sensor | |
TP Sensor, Voltage Low{5}{7} | |
No Starter Signal{8} | |
Fuel Cut Off Relay{4} | |
23 | MAT Sensor |
MAT Sensor, Low Temp{7} | |
M/C Solenoid Circuit{4} | |
Mixture control solenoid circuit failure – 1987 and 1995 Amigo/Pick-up, 1989 to 1994 V6 models | |
Power transistor circuit – 1988 to 1994 four-cylinder models | |
| Intake Air Temperature sensor voltage high – turbo, 1989 to 1995 1.6L, 1.8L, 3.2L vehicles | |
23A | MAT Sensor, Low Temp{6} |
23B | MAT Sensor, High Temp{6} |
| 24 | Vehicle Speed Sensor (VSS) circuit – V6 models |
| Pressure regulator vacuum switching valve – 1988 to 1994 four-cylinder, also Impulse non-turbo | |
25 | MAT Sensor |
Vacuum Switching Valve{4}{9} | |
MAT Sensor, High Temp{7} | |
| Intake Air Temperature sensor voltage high – turbo, 1989 to 1995 1.6L, 1.8L, 3.2L vehicles | |
| AIR VSV circuit failure | |
26 | Canister Vacuum Switching Valve{4} |
VSV System{9} | |
27 | VSV System{9} |
Constant Voltage High From VSV To ECM{4} | |
| Fuel injector driver transistor | |
31 | No Ignition Reference Pulses To ECM{4} |
Wastegate Control{7}{8} | |
| No ignition reference to ECM – 1988 and 1989 models | |
| 32 | Exhaust Gas Recirculation (EGR) system failure |
33 | MAP Sensor |
MAP Sensor, Voltage High{5}{7} | |
Fuel Injector{9} | |
33A | MAP Sensor, Voltage High–Low{6} |
33B | MAP Sensor, Voltage Low–High{6} |
34 | MAP Sensor{8}{11} |
MAP Sensor, Voltage Low{5} | |
EGR Gas Sensor Circuit{4}{7} | |
Fuel Injector{10} | |
35 | MAP Sensor Constant Voltage High{4} |
Power Transistor System{9} | |
36 | MAP Sensor Circuit{4} |
41 | Crank Angle Sensor{9} |
Cam Signal{7} | |
42 | Fuel Cut Off Relay{4} |
Electronic Spark Timing{5} | |
Ignition Control Circuit{6}{8} | |
| 43 | Throttle valve switch/Wide Open Throttle (WOT) position sensor {9} |
| Electronic spark control failure – V6 models | |
| Idle contact switch always closed (1988 to 1994 four-cylinder, also Impulse non-turbo) | |
| 1989 Manifold Absolute Pressure (MAP) circuit failure | |
| Knock sensor (1989 to 1995 1.6L, 3.2L) {8} | |
44 | O2S Lean |
Fuel Metering{9} | |
45 | Oxygen sensor (rich condition indicated) |
Fuel Metering{9} | |
51 | PROM{2}{8} |
Fuel Cut Solenoid Circuit And/Or ECM{3} carbureted four-cylinder models | |
ECM{6} | |
MEM-CAL{7} | |
PROM, Cal-Park & ECM{5} | |
ROM and/or RAM{9} | |
52 | ECM{4} |
EEPROM{8} | |
ROM and/or RAM{9} | |
PROM, Cal-Park & ECM{5} | |
53 | Switching Valve And/Or ECM{4} |
Vacuum Switching Valve{9} | |
54 | M/C (mixture control) Solenoid Circuit And/Or ECM{2} |
Vacuum Control Solenoid And/Or ECM{3} | |
Power Transistor System{9} | |
Fuel Pump, Voltage Low{5}{8} | |
| Shorted vacuum control solenoid, Faulty Electronic Control Module (ECM) – 1988 and 1989 models | |
55 | ECM{4}{8} |
PROM, Cal-Park & ECM{5} | |
| Faulty Electronic Control Module (ECM) or oxygen sensor | |
| 61 | Air flow sensor circuit failure {9} |
| 62 | Air flow sensor circuit failure {9} |
| 63 | Vehicle Speed Sensor (VSS) circuit {9} |
| 64 | Fuel injector driver transistor {9} |
65 | Throttle valve switch/Wide Open Throttle (WOT) position sensor, 1989 Manifold Absolute Pressure (MAP) circuit failure |
Full throttle switch always on | |
| 66 | Knock sensor circuit failure {9} |
| 71 | Throttle position switch signal abnormal {9} |
| 72 | VSV for EGR system short or open {9} |
| 73 | Same as 72 transister or ground {9} |
{1}—1989 I-Mark. | {2}—I-Mark, carbureted. |
{3}—Pickup, carbureted. | {4}—Carbureted models. |
{5}—Throttle body fuel injection. | {6}—Rodeo & Trooper w/3.2L engine, Stylus &
1990–92 Impulse less turbocharger. |
{7}—Stylus & 1990–92 Impulse w/turbocharger. | {8}—I-Mark, multi-port fuel injection. |
{9}—Amigo, Pickup, Rodeo & Trooper w/2.6L engine
& 1988–91 Impulse. | {10}—Impulse. |
{11}—Amigo, Pickup, Rodeo & Trooper. |
Do have the transmission codes as well?