SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
FUEL SYSTEM
Section 5G - Trouble Code Diagnostics - 7.4L MPI
Table Of Contents
Clearing Trouble Codes . . . . . . . . . . . . . .
Clearing Codes Using Diagnostic Code
Tool (Non-Scan) . . . . . . . . . . . . . . . . .
Clearing Codes Using Scan Tool
5G-3
5G-3
5G-3
5G-4
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
(Scan) . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Testing Without A Scan Tool
(Non-Scan) . . . . . . . . . . . . . . . . . . . . . . . .
Temperature (ECT) Sensor Circuit
(Scan) High Temperature Indicated
Code 21 (1 of 2): Throttle Position (TP)
Sensor Circuit (Scan) High
5G-40
Code 14 (1 of 3): Engine Coolant Tempera-
ture (ECT) Sensor Circuit (Non-Scan) Low
Temperature Indicated . . . . . . . . . . . .
5G-4
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
Code 15 (1 of 3): Engine Coolant Tempera-
ture (ECT) Sensor Circuit (Non-Scan) High
Temperature Indicated . . . . . . . . . . . .
Code 21 (1 of 2): Throttle Position (TP)
Sensor Circuit (Non-Scan) Signal
Voltage High . . . . . . . . . . . . . . . . . . . .
Code 22 (1 of 2): Throttle Position (TP)
Sensor Circuit (Non-Scan) Signal
Voltage Low . . . . . . . . . . . . . . . . . . . .
5G-6
5G-9
5
G
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-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
Bypass Circuit . . . . . . . . . . . . . . . . . . 5G-28
Code 43 (1 of 2): Knock Sensor (KS)
Circuit Continuous Knock Detected
Code 44 (1 of 3): Knock Sensor (KS)
5G-31
(Scan) . . . . . . . . . . . . . . . . . . . . . . . . . 5G-69
Circuit No Knock Detected . . . . . . . 5G-33
Code 51 (1 of 2): Calibration Memory
Failure (Non-Scan) . . . . . . . . . . . . . . 5G-36
90-861326--1
MARCH 1999
Page 5G-1
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(1 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...