Mercury MerCruiser Service Manual page 71

Important Information, Maintenance, and
Table of Contents
Introduction........................................................................ 1D-2
Before You Begin Troubleshooting.............................1D-2
Situational Awareness................................................ 1D-2
General Troubleshooting Guidelines.......................... 1D-2
Visual/Physical Check....................................................... 1D-3
Emission Control Fault Indicators...................................... 1D-4
Diagnostic Roadmap......................................................... 1D-4
Chart R1: Engine System Fails to Power Up..............1D-5
Chart R2: OBD-M Lamp Does Not Self-Test.............. 1D-6
Chart R3: Crankshaft Fails to Rotate..........................1D-7
Chart R4: Engine Cranks Over but Will Not Start.......1D-8
Chart R5: Hard Start...................................................1D-9
Chart R6: Engine Stalls............................................ 1D-10
Diagnosis by Symptom.................................................... 1D-11
Chart S1: Engine Surges..........................................1D-11
Chart S2: Lack of Power, Sluggish, or Spongy........ 1D-11
Chart S3: Detonation or Spark Knock...................... 1D-12
Chart S4: Hesitation, Sag, or Stumble......................1D-14
Chart S5: Engine Misses.......................................... 1D-15
Chart S6: Rough, Unstable, or Incorrect Idle and
Stalling.................................................................. 1D-16
90-8M0099748 eng DECEMBER 2015
Troubleshooting
Section 1D - Troubleshooting
Troubleshooting Tests..................................................... 1D-19
Troubleshooting Shift Problems.......................................1D-22
PCM 112 Calibration Information.....................................1D-22
CDS G3 Service Tool...................................................... 1D-22
© 2016 Mercury Marine
Chart S7: Poor Fuel Economy..................................1D-16
Chart S8: Dieseling or Run-On.................................1D-17
Chart S9: Backfire.................................................... 1D-18
Chart T1: Main Power Relay Test............................ 1D-19
Chart T2: Fuel System Electrical Test...................... 1D-20
Chart T3: Fuel System Diagnosis.............................1D-20
Chart T4: Ignition System Test................................. 1D-21
Default Sensor Values..............................................1D-22
Fault Conditions........................................................1D-22
Sticky and Nonsticky Faults......................................1D-22
OBD-M Faults...........................................................1D-22
Introduction...............................................................1D-22
Connecting and Starting G3..................................... 1D-22
CDS G3 Service Tool Home Screen Overview........ 1D-24
CDS G3 Fault List.....................................................1D-25
Troubleshooting
1
D
Page 1D-1