Engine Controls - Self-Diagnostics Suzuki Grand Vitara I рестайлинг

INTRODUCTION

Most engine control problems result from mechanical failures, poor electrical connections, or damaged vacuum hoses. Before condemning the computer system, perform checks and inspections covered in BASIC DIAGNOSTIC PROCEDURES article. Failure to do so may result in lost diagnostic time.

If no Diagnostic Trouble Codes (DTCs) are present, and driveability problems exist, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.).

SELF-DIAGNOSTIC SYSTEM

Note. Diagnostic information stored in Engine Control Module (ECM) memory can be retrieved and cleared using SUZUKI scan tool or On-Board Diagnostic-II (OBD-II) generic scan tool. Before using scan tool, read instruction manual carefully.

Note. Ensure to retrieve and record information stored in ECM memory as Diagnostic Trouble Codes (DTC), freeze frame data, etc. before disconnect battery cable, ECM harness connectors, ECM ground wire or main fuse. Such disconnection will erase and loose ECM memory data.

ON-BOARD DIAGNOSTICS

ECM in this vehicle in compliance with On-Board Diagnostic-II (OBD-II) regulations, has following functions

1. When ignition switch is turned to ON position, Malfunction Indicator Light (MIL) illuminates as a MIL bulb check. MIL should turn OFF when engine is running or ignition switch is turned to LOCK position.
2. When ECM detects a malfunction which would have an adverse or severe damage to vehicle emissions while engine is running, MIL flashes (flashes only when detecting a misfire which can cause damage to the catalyst). ECM stores DTC(s) in memory. If after 3 driving cycles ECM no longer detects condition that set DTC, MIL is turned OFF. DTC will remain stored in memory.
3. As a condition for detecting a malfunction, in some areas system being monitored by ECM, 2 drive cycle detection logic is adopted to prevent erroneous detection.
4. When a malfunction is detected, engine and driving conditions then are stored in ECM memory as freeze frame data. For freeze frame data details and description, see «FREEZE FRAME DATA»(/suzuki/grand-vitara/i-2000-2006/remont/testing-diagnostics/#engine-controls-self-diagnostics__freeze-frame-data) .
5. It is possible to communicate with ECM by using SUZUKI scan tool or OBD-II generic scan tool which are in compliance with SAEJ1978 (diagnostic information can be accessed by using a scan tool).

WARM-UP CYCLE

A warm-up cycle means sufficient vehicle operation such that coolant temperature has risen by at least 70°F (22°C) from engine starting point and reaches a minimum temperature of 160°F (70°C).

DRIVE CYCLE

A "Driving Cycle" consists of engine start-up driving mode where a malfunction would be detected, if present and the next engine start-up.

TWO DRIVING CYCLE DETECTION LOGIC

Malfunction detected in first driving cycle is stored in ECM memory (in the form of pending DTC and Freeze Frame data) but MIL does not illuminate at this time. MIL illuminates at the second detection of same malfunction also in the next driving cycle.

PENDING DTC

Pending DTC means a DTC detected and stored temporarily at one driving cycle of the DTC which is detected in the 2 Driving Cycle Detection Logic.

FREEZE FRAME DATA

Engine operating conditions are required to be captured and stored in ECM memory whenever a malfunction is detected. Data captured in this manner is called FREEZE FRAME data. Freeze frame data is similar to a single record of operating conditions. Whenever a malfunction is detected, corresponding record of operating conditions is recorded in the freeze frame buffer. ECM can store freeze frame data for 3 different malfunctions.

Freeze frame data can only be overwritten with data associated with a misfire or fuel trim malfunction. Misfire data takes priority over all other data because of its possible part-damaging (oxygen sensors, catalytic converters, etc.) effects. Freeze frame data will not be erased unless associated DTC is cleared from ECM memory.

Priority Of Freeze Frame Data

ECM has 4 frames where freeze frame data can be stored. The first frame stores freeze frame data of malfunction which was detected first. However, freeze frame data stored in this frame is updated according to priority described. If malfunction as described in the upper square No. 1 is detected while the freeze frame data in the lower square No. 2 has been stored, freeze frame data No. 2 will be updated by freeze frame data No. 1.

In 2nd through 4th frames, freeze frame data of each malfunction is stored in the order malfunctions are detected. This data is not updated. Examples of how freeze frame data are stored when 2 or more malfunctions are detected are shown in illustration. (Scheme 78)

Scheme 78

FAIL-SAFE FUNCTION

When a malfunction has occurred in specific areas of engine and emission control system, ECM enters "fail-safe function". When vehicle is operating in fail-safe function, ECM allows a lower level of engine performance to be available, allowing vehicle to be driven for service. When malfunction occurs a failure signal is sent to ECM, and ECM control over affected sensors and actuators is maintained on the basis of standard signals and/or a back-up program stored in ECM. While in fail-safe mode ECM ignores failure signal and/or CPU inputs. ECM will remain in fail-safe mode as long as malfunction is detected, fail-safe mode is canceled when ECM detects normal conditions. For fail-safe function parameters, and detected item. (Scheme 79)

Scheme 79

MALFUNCTION INDICATOR LIGHT CHECK

The Malfunction Indicator Light (MIL) is located at instrument cluster. (Scheme 80) As a bulb check, MIL illuminates for about 2 seconds when ignition switch is turned to ON position and engine is not running. MIL also illuminates when a system failure has been detected and a corresponding DTC has been set in ECM memory. MIL may also flash if ECM detects an engine misfire sever enough to cause catalytic converter failure. Not all trouble codes will activate MIL. If MIL is ON and no DTCs are in memory, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES in article.

Scheme 80

MIL Does Not Illuminate

Refer to MIL DOES NOT ILLUMINATE in SYSTEM TESTS.

MIL Stays On At All Times

Refer to MIL STAYS ON AT ALL TIMES in SYSTEM TESTS.

RETRIEVING DIAGNOSTIC TROUBLE CODES

DTCs are retrieved using a SUZUKI Tech 2 or other OBD-II compatible scan tool connected to a 16-pin Data Link Connector (DLC), located below left side of instrument panel. (Scheme 80) Follow scan tool manufacturer's instructions when retrieving DTCs.

Diagnostic Procedures

For diagnosis and repair (Scheme 81) For description for each step, see TEST DESCRIPTION.

Scheme 81

Scheme 82

Scheme 83

CLEARING DIAGNOSTIC TROUBLE CODES

Note. Ensure to retrieve and record information stored in ECM memory (DTC, freeze frame data, etc.) before disconnect ECM harness connectors, battery cable, ECM ground wire harness from engine or main fuse. Such disconnection will erase and loose ECM memory data.

DTCs can be cleared using a SUZUKI Tech 2 or other OBD-II compatible scan tool connected to Data Link Connector (DLC), located below left side of instrument panel. (Scheme 80) DTCs will also clear when fault that originally set that DTC is not detected during 40 engine warm-up cycles. A warm-up cycle is when vehicle coolant temperature rises by 72°F (22°C) or reaches 158°F (70°C) after engine has first started.

SCAN TOOL USAGE

Note. Before connecting scan tool, follow steps in MALFUNCTION INDICATOR LIGHT CHECK .

Scan tool is a specialized tester which can diagnose on-board computer control systems by providing almost instant access to circuit data without crawling under instrument panel or engine hood to backprobe sensors and connectors. Scan tools reduce diagnostic time by furnishing input data (sensor values) which can be compared to specification parameters.

Scan tools also furnish status data of output devices (solenoids and motors). However, status parameters are only an indication that output signals have been sent to devices by Engine Control Module (ECM). They do not indicate if devices respond properly to that signal. This must be verified at output device using a DVOM or test light.

If DTCs are not present, a problem may still exist. Driveability-related problems with DTCs displayed occur about 20 percent of the time, while driveability problems without DTCs occur about 80 percent of the time. An out-of-calibration sensor may not set a DTC, but will cause driveability problems. A scan tool is the easiest method of checking sensor specifications and other data parameters. A scan tool is also useful in finding intermittent wiring problems by wiggling wiring harnesses and connections (key on, engine off) while observing data parameters.

Note. Information obtained by a scan tool is only as accurate as the scan tool itself. A scan tool that displays faulty data should not be used. If faulty data readings are suspected, verify scan tool information using a DVOM and wiring schematic.

ENGINE CONTROL MODULE LOCATION

Engine Control Module (ECM) is located behind the glove box. (Scheme 99)

ENGINE CONTROL MODULE PROGRAMING

When substituting a known-good ECM, check for following conditions. Neglecting this check may cause damage to a known-good ECM.

1. Resistance value of all relays and actuators. See «SENSOR OPERATING RANGE CHARTS»(/suzuki/grand-vitara/i-2000-2006/remont/sensor-range-charts/#engine-controls-sensor-operating-range-charts) article.
2. Manifold Absolute Pressure (MAP) sensor, Throttle Position (TP) sensor and Fuel Tank Pressure (FTP) sensor are in good condition, and power and ground circuits of these sensors are not shorted.

SUMMARY

If no DTCs are present, and driveability symptoms exist, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.).

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DIAGNOSTIC TROUBLE CODE DEFINITIONS

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

Circuit Description

For circuit description (Scheme 84)

For diagnosis and repair (Scheme 84)and (Scheme 85).

Scheme 84

Scheme 85

MIL DOES NOT ILLUMINATE WITH IGNITION ON & ENGINE DOES NOT START

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For circuit description (Scheme 86)

For diagnosis and repair (Scheme 86)or (Scheme 87).

Scheme 86

Scheme 87

MIL STAYS ON AFTER ENGINE STARTS

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For circuit description (Scheme 88)

For diagnosis and repair (Scheme 88)

Scheme 88

ECM POWER & GROUND CIRCUIT CHECK

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 89)- (Scheme 98).

Scheme 89

Scheme 90

Scheme 91

Scheme 92

Scheme 93

Scheme 94

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

DIAGNOSTIC TESTS

Note. Before replacing any component that scan tool suggests are faulty. Ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. To identify ECM terminals referenced in testing (Scheme 102)- (Scheme 104). To identify circuits and wire colors referenced in testing, see ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

DTC P0101: MASS AIRFLOW SENSOR PERFORMANCE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 105)and (Scheme 106).

Scheme 105

Scheme 106

DTC P0102: MASS AIRFLOW SENSOR CIRCUIT - LOW VOLTAGE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 107)and (Scheme 108).

Scheme 107

Scheme 108

DTC P0103: MASS AIRFLOW SENSOR CIRCUIT - HIGH VOLTAGE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 109)and (Scheme 110).

Scheme 109

Scheme 110

DTC P0107/P0108: MANIFOLD ABSOLUTE SENSOR CIRCUIT - LOW/HIGH INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 111)and (Scheme 112).

Scheme 111

Scheme 112

DTC P0111: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - RANGE/PERFORMANCE PROBLEM

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 113)and (Scheme 114).

Scheme 113

Scheme 114

DTC P0112: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - LOW INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 115)and (Scheme 116).

Scheme 115

Scheme 116

DTC P0113: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - HIGH INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 117)and (Scheme 118).

Scheme 117

Scheme 118

DTC P0116: ENGINE COOLANT TEMPERATURE SENSOR PERFORMANCE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 119)and (Scheme 120).

Scheme 119

Scheme 120

DTC P0117: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - LOW INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 121)and (Scheme 122).

Scheme 121

Scheme 122

DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - HIGH INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 123)and (Scheme 124).

Scheme 123

Scheme 124

DTC P0121: THROTTLE POSITION SENSOR CIRCUIT PERFORMANCE PROBLEM

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 125)and (Scheme 126).

Scheme 125

Scheme 126

DTC P0122: THROTTLE POSITION SENSOR CIRCUIT - LOW INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 127)and (Scheme 128).

Scheme 127

Scheme 128

DTC P0123: THROTTLE POSITION SENSOR CIRCUIT - HIGH INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 129)and (Scheme 130).

Scheme 129

Scheme 130

DTC P0125: INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 131)and (Scheme 132).

Scheme 131

Scheme 132

DTC P0128: COOLANT THERMOSTAT (COOLANT TEMPERATURE LESS THAN REGULATING TEMPERATURE)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 133)and (Scheme 134).

Scheme 133

Scheme 134

DTC P0131: HEATED OXYGEN SENSOR CIRCUIT - LOW INPUT (BANK 1; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 135)and (Scheme 136).

Scheme 135

Scheme 136

DTC P0132/P2231: HEATED OXYGEN SENSOR CIRCUIT - HIGH VOLTAGE/SHORTED HEATER POWER SUPPLY (BANK 1; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 137)and (Scheme 138).

Scheme 137

Scheme 138

DTC P0133: HEATED OXYGEN SENSOR CIRCUIT - SLOW RESPONSE (BANK 1; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 139)and (Scheme 140).

Scheme 139

Scheme 140

DTC P0134: HEATED OXYGEN SENSOR - NO ACTIVITY DETECTED (BANK 1; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 141)and (Scheme 142).

Scheme 141

Scheme 142

DTC P0135: HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION (BANK 1; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 143)and (Scheme 144).

Scheme 143

Scheme 144

DTC P0137/P0138/P2232: HEATED OXYGEN SENSOR CIRCUIT - LOW VOLTAGE/HIGH VOLTAGE/SHORTED TO HEATER CIRCUIT (BANK 1; SENSOR 2)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 145)and (Scheme 146).

Scheme 145

Scheme 146

DTC P0141: HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION (BANK 1; SENSOR 2)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 147)and (Scheme 148).

Scheme 147

Scheme 148

DTC P0151: HEATED OXYGEN SENSOR CIRCUIT - LOW INPUT (BANK 2; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 149)and (Scheme 150).

Scheme 149

Scheme 150

DTC P0152/P2234: HEATED OXYGEN SENSOR CIRCUIT - HIGH VOLTAGE/SHORTED TO HO2S POWER SUPPLY

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 151)and (Scheme 152).

Scheme 151

Scheme 152

DTC P0153: HEATED OXYGEN SENSOR - SLOW RESPONSE (BANK 2; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 153)and (Scheme 154).

Scheme 153

Scheme 154

DTC P0154: HEATED OXYGEN SENSOR - NO ACTIVITY DETECTED (BANK 2; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 155)and (Scheme 156).

Scheme 155

Scheme 156

DTC P0155: HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2; SENSOR 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 157)and (Scheme 158).

Scheme 157

DTC P0157/P0158/P2235: HEATED OXYGEN SENSOR CIRCUIT - LOW VOLTAGE/HIGH VOLTAGE/SHORTED TO HEATER CIRCUIT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 159)and (Scheme 160).

Scheme 158

Scheme 159

DTC P0161: HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2; SENSOR 2)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 161)and (Scheme 162).

Scheme 160

Scheme 161

DTC P0171/P0172: FUEL SYSTEM TOO LEAN/RICH (BANK 1)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 163)and (Scheme 164).

Scheme 162

Scheme 163

DTC P0174/P0175: FUEL SYSTEM TOO LEAN/RICH (BANK 2)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 165)and (Scheme 166).

Scheme 164

Scheme 165

DTC P0300/P0301/P0302/P0303/P0304/P0305/P0306: MISFIRE DETECTED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 167)and (Scheme 168).

Scheme 166

Scheme 167

DTC P0335: CRANKSHAFT POSITION SENSOR CIRCUIT MALFUNCTION

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 169)and (Scheme 170).

Scheme 168

Scheme 169

DTC P0340: CAMSHAFT POSITION SENSOR CIRCUIT MALFUNCTION

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 171)and (Scheme 172).

Scheme 170

Scheme 171

DTC P0401: EGR FLOW MALFUNCTION

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 173), (Scheme 174) and (Scheme 175).

Scheme 172

Scheme 173

Scheme 174

DTC P0403: EGR CONTROL CIRCUIT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 176)and (Scheme 177).

Scheme 175

Scheme 176

DTC P0420/P0430: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1 OR 2)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 178)and (Scheme 179).

Scheme 177

Scheme 178

DTC P0442/P0455: EVAP CONTROL SYSTEM LEAK DETECTED (SMALL/GROSS LEAK)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 180), (Scheme 181) and (Scheme 182).

Scheme 179

Scheme 180

Scheme 181

DTC P0444/P0496: EVAP PURGE CONTROL CIRCUIT OPEN/EVAP SYSTEM FLOW DURING NON-PURGE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 183), (Scheme 184) and (Scheme 185).

Scheme 182

Scheme 183

Scheme 184

DTC P0445: EVAP PURGE CONTROL VALVE CIRCUIT SHORTED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 186)and (Scheme 187).

Scheme 185

Scheme 186

DTC P0447: EVAP VENT CONTROL CIRCUIT OPEN

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 188)and (Scheme 189).

Scheme 187

Scheme 188

DTC P0448: EVAP VENT CONTROL CIRCUIT SHORTED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 190)and (Scheme 191).

Scheme 189

Scheme 190

DTC P0451: EVAP PRESSURE SENSOR PERFORMANCE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 192), (Scheme 193) and (Scheme 194).

Scheme 191

Scheme 192

Scheme 193

DTC P0452/P0453: EVAP PRESSURE SENSOR - LOW/HIGH INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 195)and (Scheme 196).

Scheme 194

Scheme 195

DTC P0456: EVAP SYSTEM LEAK DETECTED (VERY SMALL LEAK)

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 197)and (Scheme 198).

Scheme 196

Scheme 197

DTC P0461: FUEL LEVEL SENSOR CIRCUIT PERFORMANCE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 199)and (Scheme 200).

Scheme 198

Scheme 199

DTC P0463: FUEL LEVEL SENSOR CIRCUIT - HIGH INPUT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 201)and (Scheme 202).

Scheme 200

Scheme 201

DTC P0464: FUEL LEVEL SENSOR CIRCUIT - INTERMITTENT

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 203)and (Scheme 204).

Scheme 202

Scheme 203

DTC P0500: VEHICLE SPEED SENSOR MALFUNCTION

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 205), (Scheme 206) and (Scheme 207).

Scheme 204

Scheme 205

Scheme 206

DTC P0505/P0506/P0507: IDLE AIR CONTROL SYSTEM - RPM LOWER THAN EXPECTED/RPM HIGHER THAN EXPECTED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 208), (Scheme 209) and (Scheme 210).

Scheme 207

Scheme 208

Scheme 209

DTC P0601: INTERNAL CONTROL MODULE MEMORY CHECK SUM ERROR

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 211)

Scheme 210

DTC P0616/P0617: STARTER RELAY CIRCUIT - LOW/HIGH

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 212)and (Scheme 213).

Scheme 211

Scheme 212

DTC P1510: ECM BACK-UP POWER SUPPLY MALFUNCTION

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 214)

Scheme 213

DTC P2025: EVAP FUEL VAPOR TEMPERATURE SENSOR PERFORMANCE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 215), (Scheme 216) and (Scheme 217).

Scheme 214

Scheme 215

Scheme 216

DTC P2026/P2027: EVAP FUEL VAPOR TEMPERATURE SENSOR CIRCUIT - LOW/HIGH VOLTAGE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair (Scheme 218)and (Scheme 219).

Scheme 217

Scheme 218

DTC P2227/P2228/P2229: BAROMETRIC PRESSURE CIRCUIT PERFORMANCE - LOW/HIGH

Note. For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .

For diagnosis and repair see scheme 143

Scheme 219

WIRING DIAGRAMS

Note. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in WIRING DIAGRAMS.

See also:
• BASIC DIAGNOSTIC PROCEDURES
• TROUBLE SHOOTING - NO CODES
• SENSOR OPERATING RANGE CHARTS
• FREEZE FRAME DATA
• MIL DOES NOT ILLUMINATE
• MIL STAYS ON AT ALL TIMES
• MALFUNCTION INDICATOR LIGHT CHECK
• P0101
• P0102
• P0103
• P0107
• P0111
• P0112
• P0113
• P0116
• P0117
• P0118
• P0121
• P0122
• P0123
• P0125
• P0128
• P0131
• P0132
• P0133
• P0134
• P0135
• P0137
• P0141
• P0151
• P0152
• P0153
• P0154
• P0155
• P0157
• P0161
• P0171
• P0174
• P0300
• P0335
• P0340
• P0401
• P0403
• P0420
• P0442
• P0444
• P0445
• P0447
• P0448
• P0451
• P0452
• P0456
• P0461
• P0463
• P0464
• P0500
• P0505
• P0601
• P0616
• P1510
• P2025
• P2026
• P2227
• WIRING DIAGRAMS