5
G
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5G-1
FUEL SYSTEM
Section 5G - Trouble Code Diagnostics - 7.4L MPI
Table Of Contents
Clearing Trouble Codes 5G-3. . . . . . . . . . . . . .
Clearing Codes Using Diagnostic Code
Tool (Non-Scan) 5G-3. . . . . . . . . . . . . . . . .
Clearing Codes Using Scan Tool
(Scan) 5G-3. . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Testing Without A Scan Tool
(Non-Scan) 5G-4. . . . . . . . . . . . . . . . . . . . . . . .
Code 14 (1 of 3): Engine Coolant Tempera-
ture (ECT) Sensor Circuit (Non-Scan) Low
Temperature Indicated 5G-4. . . . . . . . . . . .
Code 15 (1 of 3): Engine Coolant Tempera-
ture (ECT) Sensor Circuit (Non-Scan) High
Temperature Indicated 5G-6. . . . . . . . . . . .
Code 21 (1 of 2): Throttle Position (TP)
Sensor Circuit (Non-Scan) Signal
Voltage High 5G-9. . . . . . . . . . . . . . . . . . . .
Code 22 (1 of 2): Throttle Position (TP)
Sensor Circuit (Non-Scan) Signal
Voltage Low 5G-11. . . . . . . . . . . . . . . . . . . .
Code 23 (1 of 3): Intake Air Temperature
(IAT) Sensor Circuit (Non-Scan) Low
Temperature Indicated 5G-14. . . . . . . . . . .
Code 25 (1 of 3): Intake Air Temperature
(IAT) Sensor Circuit (Non-Scan) High
Temperature Indicated 5G-16. . . . . . . . . . .
Code 33 (1 of 3): Manifold Absolute
Pressure (MAP) Sensor Circuit (Non-
Scan) High Signal Voltage 5G-19. . . . . . . .
Code 34 (1 of 3): Manifold Absolute
Pressure (MAP) Sensor Circuit (Non-
Scan) Low Signal Voltage 5G-22. . . . . . . .
Code 41 (1 of 3): Ignition Control (IC)
Circuit (Non-Scan) - Open IC Circuit 5G-25
Code 42 (1 of 3): Ignition Control (IC)
Circuit (Non-Scan) - Grounded IC Circuit,
Open Bypass Circuit, or Grounded
Bypass Circuit 5G-28. . . . . . . . . . . . . . . . . .
Code 43 (1 of 2): Knock Sensor (KS)
Circuit Continuous Knock Detected 5G-31
Code 44 (1 of 3): Knock Sensor (KS)
Circuit No Knock Detected 5G-33. . . . . . .
Code 51 (1 of 2): Calibration Memory
Failure (Non-Scan) 5G-36. . . . . . . . . . . . . .
Diagnostic Testing Using A Scan Tool 5G-38. .
Code 14 (1 of 3): Engine Coolant Tempera-
ture (ECT) Sensor Circuit (Scan) - Low
Temperature Indicated 5G-38. . . . . . . . . . .
Code 15 (1 of 3): Engine Coolant
Temperature (ECT) Sensor Circuit
(Scan) High Temperature Indicated 5G-40
Code 21 (1 of 2): Throttle Position (TP)
Sensor Circuit (Scan) High
Signal Voltage 5G-43. . . . . . . . . . . . . . . . . .
Code 22 (1 of 3): Throttle Position (TP)
Sensor Circuit (Scan) Low Signal
Voltage 5G-45. . . . . . . . . . . . . . . . . . . . . . . . .
Code 23 (1 of 3): Intake Air Temperature
(IAT) Sensor Circuit (Scan) - Low
Temperature Indicated 5G-47. . . . . . . . . . .
Code 25 (1 of 2): Intake Air Temperature
(IAT) Sensor Circuit (Scan) High
Temperature Indicated 5G-50. . . . . . . . . . .
Code 33 (1 of 3): Manifold Absolute
Pressure (MAP) Sensor Circuit (Scan)
High Signal Voltage 5G-52. . . . . . . . . . . . . .
Code 34 (1 of 3): Manifold Absolute
Pressure (MAP) Sensor Circuit (Scan) -
Low Signal Voltage 5G-55. . . . . . . . . . . . . .
Code 41 (1 of 3): Ignition Control (IC)
Circuit (Scan) - Open IC Circuit 5G-58. . . .
Code 42 (1 of 3): Ignition Control (IC)
Circuit (Scan) - Grounded IC Circuit,
Open Bypass Circuit, or Grounded
Bypass Circuit 5G-60. . . . . . . . . . . . . . . . . .
Code 43 (1 of 2): Knock Sensor (KS)
Circuit (Scan) - Continuous Knock
Detected 5G-63. . . . . . . . . . . . . . . . . . . . . . .
Code 44 (1 of 3): Knock Sensor (KS)
Circuit (Scan) -No Knock Detected 5G-65.
Code 51 (1 of 1): Calibration Memory
Failure (Scan) 5G-68. . . . . . . . . . . . . . . . . . .
Code 52 (1 of 1): EEPROM Failure
(Scan) 5G-69. . . . . . . . . . . . . . . . . . . . . . . . .
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