Isuzu engine C22NE / 22LE / 20LE. Manual - part 44

DRIVEABILITY AND EMISSIONS  6E1-5

PAGE

Legend ..................................................................................................................... 6E1- 76

Results of Incorrect Operation .............................................................................. 6E1- 76

Diagnosis................................................................................................................. 6E1- 77

Legend ..................................................................................................................... 6E1- 77

Visual Check of Canister........................................................................................ 6E1- 77

Evaporative Emission Canister Purge Control Solenoid Valve Check

(If applicable) ............................................................................................................... 6E1- 78

Circuit Description.................................................................................................. 6E1- 78

Test Description...................................................................................................... 6E1- 78

Diagnostic Aids....................................................................................................... 6E1- 78

General Description .................................................................................................... 6E1- 79

Legend ..................................................................................................................... 6E1- 79

ECM Diagnostic Trouble Codes ................................................................................. 6E1- 80

SYMPTOM DIAGNOSIS ............................................................................................... 6E1- 81

PRELIMINARY CHECKS.............................................................................................. 6E1- 81

VISUAL/PHYSICAL CHECK......................................................................................... 6E1- 81

INTERMITTENT ............................................................................................................ 6E1- 81

Hard Start Symptom ............................................................................................... 6E1- 82

Surges and/or Chuggles symptom........................................................................ 6E1- 84

Lack of Power, Sluggish or Spongy Symptom .................................................... 6E1- 86

Detonation/Spark Knock Symptom ....................................................................... 6E1- 88

Rough, Unstable, or Incorrect Idle, Stalling Symptom

(For Open Loop System) ........................................................................................ 6E1- 90

Rough, Unstable, or incorrect Idle, Stalling Sympton

(For Closed Loop System) ..................................................................................... 6E1- 92

Idle CO Concentration Check and adjustment..................................................... 6E1- 94

Poor Fuel Economy Symptom ............................................................................... 6E1- 95

Dieseling, Run-On Symptom.................................................................................. 6E1- 97

Backfire Symptom .................................................................................................. 6E1- 98

Cuts, Out, Misses Symptom .................................................................................. 6E1-100

Hesitation, Sag, Stumble Symptom....................................................................... 6E1-103

DEFAULT MATRIX TABLE .......................................................................................... 6E1-105

SERVICE PROCEDURE DEFAULT STRATEGY ......................................................... 6E1-105

Default Matrix Table................................................................................................ 6E1-105

6E1-6  DRIVEABILITY AND EMISSIONS

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ENGINE CRANKS BUT WILL NOT RUN ..................................................................... 6E1-108

Circuit Description.................................................................................................. 6E1-108

Diagnostic Aids....................................................................................................... 6E1-108

Engine Cranks But Will Not Run ........................................................................... 6E1-108

FUEL SYSTEM ELECTRICAL TEST............................................................................ 6E1-113

Circuit Description.................................................................................................. 6E1-113

Diagnostic Aids....................................................................................................... 6E1-113

Test Description...................................................................................................... 6E1-114

Fuel Pressure Relief Procedure............................................................................. 6E1-114

Fuel Pressure Gauge Installation .......................................................................... 6E1-114

Fuel System Electrical Test ................................................................................... 6E1-114

FUEL SYSTEM DIAGNOSIS ........................................................................................ 6E1-117

Circuit Description.................................................................................................. 6E1-117

Test Description...................................................................................................... 6E1-117

Fuel Pressure Relief Procedure............................................................................. 6E1-119

Fuel Pressure Gauge Installation .......................................................................... 6E1-119

Fuel System Diagnosis........................................................................................... 6E1-119

MANIFOLD ABSOLUTE PRESSURE (MAP) OUTPUT CHECK .................................. 6E1-123

Circuit Description.................................................................................................. 6E1-123

Test Description...................................................................................................... 6E1-123

Manifold Absolute Pressure (MAP) Output Check ............................................... 6E1-124

EVAPORATIVE EMISSIONS (EVAP)

CANISTER PURGE CONTROL SOLENOID VALVE CHECK...................................... 6E1-125

Circuit Description.................................................................................................. 6E1-125

Diagnostic Aids....................................................................................................... 6E1-125

Test Description...................................................................................................... 6E1-125

Evaporative Emissions (EVAP)

Canister Purge Valve Solenoid Check .................................................................. 6E1-126

THROTTLE POSITION (TP) SENSOR CIRCUIT RANGE/PERFORMANCE

PROBLEM .................................................................................................................... 6E1-129

Circuit Description.................................................................................................. 6E1-129

Diagnostic Aids....................................................................................................... 6E1-129

TP Sensor Circuit Range/Performance Problem.................................................. 6E1-130

DRIVEABILITY AND EMISSIONS  6E1-7

PAGE

DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=22)

THROTTLE POSITION (TP) SENSOR CIRCUIT LOW INPUT..................................... 6E1-133

Circuit Description.................................................................................................. 6E1-133

Conditions for setting the DTC .............................................................................. 6E1-133

Action Taken when the DTC Sets .......................................................................... 6E1-133

Conditions for Clearing the MIL/DTC .................................................................... 6E1-133

Diagnostic Aids....................................................................................................... 6E1-134

DTC (Flash DTC=22) Throttle Position (TP) Sensor Circuit Low Input ................... 6E1-134

DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=21)

THROTTLE POSITION (TP) SENSOR CIRCUIT HIGH INPUT .................................... 6E1-137

Circuit Description.................................................................................................. 6E1-137

Conditions for Setting the DTC.............................................................................. 6E1-137

Action Taken When the DTC sets.......................................................................... 6E1-137

Diagnostic Aids....................................................................................................... 6E1-137

Test Description...................................................................................................... 6E1-138

DTC (Flash DTC=21) Throttle Position (TP) Sensor Circuit High Input .................. 6E1-138

DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=13)

02 SENSOR CIRCUIT NOT READY DETECTED (IF APPLICABLE) .......................... 6E1-141

Circuit Description.................................................................................................. 6E1-141

Conditions for Setting the DTC.............................................................................. 6E1-141

Action Taken When the DTC Sets ......................................................................... 6E1-141

Conditions for Clearing the MIL/DTC .................................................................... 6E1-141

Diagnostic Aids....................................................................................................... 6E1-142

DTC (Flash DTC=13) 02 Sensor Circuit Not Ready ................................................... 6E1-142

DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=44)

02 SENSOR TOO LEAN (IF APPLICABLE)................................................................. 6E1-145

Circuit Description.................................................................................................. 6E1-145

Conditions for Setting the DTC.............................................................................. 6E1-145

Action Taken When the DTC Sets ......................................................................... 6E1-145

Conditions for Clearing the MIL/DTC .................................................................... 6E1-145

Diagnostic Aids....................................................................................................... 6E1-146

DTC (Flash DTC=44) 02 Sensor Too Lean ................................................................. 6E1-146

DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=45)

02 SENSOR TOO RICH (IF APPLICABLE).................................................................. 6E1-149

6E1-8  DRIVEABILITY AND EMISSIONS

PAGE

Circuit Description.................................................................................................. 6E1-149

Conditions for setting the DTC .............................................................................. 6E1-149

Action Taken When the DTC Sets ......................................................................... 6E1-149

Conditions for Clearing the MIL/DTC .................................................................... 6E1-149

Diagnostic Aids....................................................................................................... 6E1-150

DTC (Flash DTC=45) 02 Sensor Too Rich ................................................................. 6E1-150

DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=14)

EINGINE COOLANT TEMPERATURE(ECT) SENSOR CIRCUIT HIGH INPUT .......... 6E1-153

Circuit Description.................................................................................................. 6E1-153

Conditions for Setting the DTC.............................................................................. 6E1-153

Action Taken When the DTC Sets ......................................................................... 6E1-153

Conditions for Clearing the MIL/DTC .................................................................... 6E1-153

Diagnostic Aids....................................................................................................... 6E1-154

Test Description...................................................................................................... 6E1-154

Engine Coolant Temperature Sensor.................................................................... 6E1-154

DTC (Flash DTC=14) ECT Sensor Circuit High Input................................................ 6E1-154

DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=15)

ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT LOW INPUT ........... 6E1-157

Circuit Description.................................................................................................. 6E1-157

Conditions for Setting the DTC.............................................................................. 6E1-157

Action Taken When the DTC Sets ......................................................................... 6E1-157

Conditions for Clearing the MIL/DTC .................................................................... 6E1-157

Diagnostic Aids....................................................................................................... 6E1-158

Test Description...................................................................................................... 6E1-158

Engine Coolant Temperature Sensor.................................................................... 6E1-158

DTC (Flash DTC=15) Engine Coolant Temperature (ECT)

Sensor Circuit Low Input ............................................................................................ 6E1-158

DIAGNOSITC TROUBLE CODE (DTC) (Flash DTC=16)

KNOCK SENSOR (KS) DISCONNECTED MALFUNCTION ........................................ 6E1-161

Circuit Description.................................................................................................. 6E1-161

Conditions for Setting the DTC.............................................................................. 6E1-161

Action Taken When the DTC Sets ......................................................................... 6E1-161

Conditions for Clearing the MIL/DTC .................................................................... 6E1-161

Diagnostic Aids....................................................................................................... 6E1-161