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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.

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