Section 5F - Fuel Injection System Troubleshooting
Scan Tool Normal Specifications (Idle / Warm
Detonation / Spark Knock Symptom . . .
Hesitation, Sag, Stumble Symptom . . . .
Cuts Out, Misses Symptom . . . . . . . . . . .
Rough, Unstable, or Incorrect Idle,
Stalling Symptom . . . . . . . . . . . . . . . . . . .
Poor Fuel Economy Symptom . . . . . . . .
Dieseling, Run-On Symptom . . . . . . . . . .
Backfire Symptom . . . . . . . . . . . . . . . . . . .
5F-11
5F-13
5F-15
Engine / Closed Throttle / Neutral) . . . .
Important Preliminary Checks . . . . . . . . .
Before Starting . . . . . . . . . . . . . . . . . . .
Visual / Physical Check . . . . . . . . . . . .
Intermittents . . . . . . . . . . . . . . . . . . . . . . . .
Hard Start Symptom . . . . . . . . . . . . . . . . .
Surges and/or Chuggles Symptom . . . .
Lack of Power, Sluggish or
5F-2
5F-3
5F-3
5F-3
5F-4
5F-5
5F-7
5F-17
5F-20
5F-22
5F-23
Spongy Symptom . . . . . . . . . . . . . . . . . . .
5F-9
Section 5G - Diagnostics
Special Tools . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Circuit Check . . . . . . . . . . . . .
Scan Tool Normal Specifications . . .
Diagnostic Trouble Codes . . . . . . . . . . . .
ECM Connector and EFI
Symptoms Chart . . . . . . . . . . . . . . . . . . . .
J-1 Circuits with MEFI 1 and MEFI 2
J-2 Circuits with MEFI 1 and MEFI 2
J-1 Circuits with MEFI 3 . . . . . . . . . . . 5G-10
J-2 Circuits with MEFI 3 . . . . . . . . . . . 5G-12
Wiring System Diagrams . . . . . . . . . . . . . 5G-14
MEFI 1 and MEFI 2 . . . . . . . . . . . . . . . 5G-14
MEFI 3 . . . . . . . . . . . . . . . . . . . . . . . . . . 5G-18
MEFI 3 With Mercury Distributor . . . . 5G-20
MEFI 3 With GM EST Distributor . . . 5G-21
Injector Balance Test (Multi-Port Models) 5G-22
Test Procedure . . . . . . . . . . . . . . . . . . . 5G-22
Test Example . . . . . . . . . . . . . . . . . . . . 5G-23
General Diagnostic Tests . . . . . . . . . . . . . 5G-24
On-Board Diagnostic (OBD)
System Check . . . . . . . . . . . . . . . . . . . 5G-24
Chart A-1 No MIL or No DLC Data . . 5G-26
Chart A-2 MIL ON Steady -
Will Not Flash DTC 12 . . . . . . . . . . . . 5G-28
Chart A-3 Engine Cranks But
Will Not Run . . . . . . . . . . . . . . . . . . . . . 5G-30
Chart A-4 Fuel System Diagnosis . . . 5G-32
Chart A-5 Fuel System Electrical Test 5G-34
Chart A-6 EFI System/Ignition
5G-2
5G-4
5G-4
5G-5
Clearing Trouble Codes . . . . . . . . . . . . . . 5G-52
Using Code Mate Tester . . . . . . . . . . . 5G-52
Using Scan Tool . . . . . . . . . . . . . . . . . . 5G-52
Diagnostic Testing . . . . . . . . . . . . . . . . . . . 5G-53
Code 14 Engine Coolant Temperature
5G-6
5G-6
5G-8
(ECT) Sensor Circuit . . . . . . . . . . . . . 5G-53
Code 15 Engine Coolant Temperature
(ECT) Sensor Circuit . . . . . . . . . . . . . 5G-56
Code 21 Throttle Position
(TP) Sensor Circuit . . . . . . . . . . . . . . . 5G-58
Code 22 Throttle Position
(TP) Sensor Circuit . . . . . . . . . . . . . . . 5G-61
Code 23 Intake Air Temperature
(IAT) Sensor Circuit . . . . . . . . . . . . . . 5G-64
Code 25 Intake Air Temperature
(IAT) Sensor Circuit . . . . . . . . . . . . . . 5G-66
Code 33 Manifold Absolute Pressure
(MAP) Sensor Circuit . . . . . . . . . . . . . 5G-68
Code 34 Manifold Absolute Pressure
(MAP) Sensor Circuit . . . . . . . . . . . . . 5G-71
Code 41 Ignition Control (IC) Circuit . 5G-74
Code 42 Ignition Control (IC) Circuit . 5G-76
Code 43 Knock Sensor (KS) Circuit . 5G-78
Code 44 Knock Sensor (KS) Circuit . 5G-81
Code 45 Ignition Coil Driver Fault . . . 5G-84
5G-86
Code 52 EEPROM Failure . . . . . . . . . 5G-87
Code 61 Fuel Pressure (FP) Circuit . 5G-88
Code 62 Fuel Pressure (FP)
Code 51 Calibration Memory Failure
Relay Check . . . . . . . . . . . . . . . . . . . . 5G-36
Chart A-7 Ignition System Check . . . 5G-38
Chart A-8 Idle Air Control (IAC)
Functional Test . . . . . . . . . . . . . . . . . . 5G-44
Discrete Input Circuit Check -
Non-Scan Only . . . . . . . . . . . . . . . . . . 5G-46
Sensor Circuit . . . . . . . . . . . . . . . . . . . 5G-91
Page xii
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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