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Engine Controls - System/component Tests: Wiring Chevrolet Metro I

Testing & Diagnostics 1 illustration

PCM Harness Resistance

Turn ignition switch to LOCK position. Disconnect PCM and related component harness connectors. Check for open or short circuits between PCM harness connector terminal and component harness connector terminal. See POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION. (Scheme 6) See appropriate wiring diagram in WIRING DIAGRAMS article. If harness is open or shorted, repair as necessary.

Scheme 6

Scheme 6: POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION
Scheme 6: POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION
Connector/Terminal No. (1)Wire ColorFunction
C1/1BLK/GRNPCM Ground
C1/2WHT/BLUIgnition Positive Voltage
C1/3RED/WHTEVAP Canister Vent Solenoid Control
C1/4PNKHO2S 2 Heater Control
C1/5RED/BLKEGR By-Pass Valve Control
C1/6GRNEGR Solenoid Vacuum Valve Control
C1/7RED/GRNEVAP Canister Purge Valve Control
C1/8 & 9—Not Used
C1/10ORGIgnition Trigger Signal
C1/11GRY/YELIdle Speed Control (ISC) Motor Control
C1/12YEL/BLKFuel Injector Control
C1/13BLK/BLUPCM Ground
C1/14WHTMemory Power Input
C1/15WHT/BLUIgnition Positive Voltage
C1/16GRY/BLKIdle Speed Control (ISC) Motor Relay Control
C1/17PPL/YELMIL Control
C1/18PPL/REDUpshift Indicator Light Control
C1/19RED/BLUEVAP Tank Pressure Control Solenoid Control Vacuum Valve Control
C1/20BLUEngine Cooling Fan Relay Control
C1/21PNK/WHTFuel Pump Relay Control
C1/22BLU/BLKMain Relay Control
C1/23—Not Used
C1/24GRY/REDIdle Speed Control (ISC) Motor Control
C1/25YEL/REDEarly Fuel Evaporation (EFE) Heater Relay Control
C1/26BLK/REDPCM Ground
C2/1LT GRNReference Voltage
C2/2ORGIgnition Reference High (CMP Sensor)
C2/3WHT/BLKIgnition Reference High (CKP Sensor)
C2/4GRY/GRNClosed Throttle Position (CTP) Switch Signal
C2/5LT GRN/REDMAP Sensor Input
C2/6LT GRN/WHTTP Sensor Input
C2/7GRY/WHTECT Sensor Input
C2/8PNK/BLKHO2S 1 Heater Control
C2/9LT GRN/BLKSensor Ground
C2/10WHTIgnition Reference Low (CMP Sensor)
C2/11WHT/REDIgnition Reference Low (CKP Sensor)
C2/12WHT/BLKEarly Fuel Evaporation (EFE) ON Signal
C2/13REDHO2S 1 Signal
C2/14GRYIAT Sensor Input
C2/15—Not Used
C2/16BLK/YELClutch Pedal Position (CCP) Switch Input
C3/1-5—Not Used
C3/6BLU/YELDiagnostic Request Signal
C3/7PPL/GRNTest Switch Signal
C3/8YELHO2S 2 Signal
C3/9—Not Used
C3/10YEL/REDFuel Level Sensor Input
C3/11YEL/GRNVSS Input
C3/12PPL/WHTSerial Data Output
C3/13-16—Not Used
C3/17LT GRN/REDA/C Cut-Out Control
C3/18BRN/YELElectrical Load Idle-Up Signal
C3/19BLU/REDA/C Idle-Up Signal
C3/20BLK/WHTIgnition Positive Signal
C3/21LT GRN/YELFuel Tank Pressure Sensor Input
C3/22—Not Used
(1) (Scheme 6)

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (1.0L)

Connector/Terminal No. (1)Wire ColorFunction
C1/1BLK/GRNPCM Ground
C1/2WHT/BLUIgnition Positive Voltage
C1/3PNK/BLUEVAP Canister Vent Solenoid Control
C1/4PNKHO2S 2 Heater Control
C1/5ORG/GRNShift Solenoid B (A/T)
C1/6ORGShift Solenoid A (A/T)
C1/7RED/GRNEVAP Canister Purge Valve Control
C1/8 & 9—Not Used
C1/10GRY/REDIgnition Trigger Signal 1-4 Coil
C1/11BRN/BLKFuel Injector No. 3 Control
C1/12BRN/WHTFuel Injector No. 1 Control
C1/13BLK/BLUPCM Ground
C1/14WHTMemory Power Input
C1/15WHT/BLUIgnition Positive Voltage
C1/16LT GRN/REDEVAP Tank Pressure Control Solenoid Vacuum Valve Control
C1/17PPL/YELMIL Control
C1/18PNK/WHTFuel Pump Relay Control
C1/19BLU/BLKMain Relay Control
C1/20BLUEngine Cooling Fan Relay Control
C1/21 & 22—Not Used
C1/23GRY/BLUIgnition Trigger Signal 2-3 Coil
C1/24BRN/YELFuel Injector No. 4 Control
C1/25BRN/REDFuel Injector No. 2 Control
C1/26BLK/REDPCM Ground
C2/1LT GRNReference Voltage
C2/2ORGIgnition Reference High (CMP Sensor)
C2/3WHT/BLKIgnition Reference High (CKP Sensor)
C2/4PPL (2)VSS High
C2/5ORG/GRNMAP Sensor Input
C2/6LT GRN/WHTTP Sensor Input
C2/7PNK/BLKHO2S 1 Heater Control
C2/8—Not Used
C2/9LT GRN/BLKSensor Ground
C2/10GRY/WHTECT Sensor Input
C2/11WHT/REDIgnition Reference Low (CKP Sensor)
C2/12GRY/YELVSS Low (A/T)
C2/13REDHO2S 1 Signal
C2/14GRYIAT Sensor Input
C2/15BLU/WHTPower Steering Pressure Switch Input
C2/16BLK/YELTransmission Range (TR) Switch Input (A/T); Closed Pedal Position (CPP) Switch Input (M/T)
C3/1—Not Used
C3/2RED/YELIdle Air Control (IAC) Valve
C3/3GRN2 Position Signal (A/T)
C3/4ORG/YELN Position Signal (A/T)
C3/5ORG/BLKP Position Signal (A/T)
C3/6BRNTachometer (If Equipped)
C3/7PPL/GRNTest Switch Signal
C3/8BLU/YELDiagnostic Request Signal
C3/9BLK/BLUGround (With Tachometer)
C3/10YELHO2S 2 Signal
C3/11YEL/REDFuel Level Sensor Input
C3/12PPL/WHTSerial Data Output
C3/13PPL/REDDuty Output Terminal
C3/14GRN/BLUL Position Signal (A/T)
C3/15GRN/REDD Position Signal (A/T)
C3/16REDR Position Signal (A/T)
C3/17GRYA/C Cut-Out Control
C3/18BRN/WHTElectrical Load Idle-Up Signal
C3/19BLU/REDA/C Idle-Up Signal
C3/20BLK/WHTIgnition Positive Voltage
C3/21LT GRN/YELFuel Tank Pressure Sensor Input
C3/22LT GRN/BLKSensor Ground
(1) (Scheme 6) (2) Yellow/Green wire on M/T.
(2)Yellow/Green wire on M/T.

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (1.3L)

Connector/Terminal No. (1)Wire ColorFunction
C1/1BLK/WHTIgnition Positive Voltage (4-spd A/T)
C1/2—Not Used
C1/3—Not Used
C1/4BLKCrankshaft Position Signal
C1/5BLKCamshaft Position Signal
C1/6BLU/REDPower Steering Pressure Signal
C1/7REDEVAP Pressure Switching Solenoid Control
C1/8BLU/BLKEVAP Canister Purge Solenoid Valve Control
C1/9—Not Used
C1/10BLK/BLUIAC Open Control
C1/11BLK/REDFuel Injector No. 2 Control
C1/12YELFuel Injector No. 1 Control
C1/13BRNGround
C1/14BRNGround
C1/15—Not Used
C1/16BLU/YELIgnition Fail-Safe Input
C1/17WHTCMP & CKP Sensor Ground
C1/18—Not Used
C1/19RED/BLUIgnition Trigger Signal 2
C1/20YEL/GRNIgnition Trigger Signal 1
C1/21BLU/YELTCC Solenoid Control (4-spd A/T)
C1/22BRN/YELShift Solenoid No. 2 Control (4-spd A/T)
C1/23PPLShift Solenoid No. 1 Control (4-spd A/T)
C1/24BLKFuel Injector No. 4 Control
C1/25WHTFuel Injector No. 3 Control
C1/26BRNGround
C2/1YELReference Voltage
C2/2LT GRN/REDMAP Input
C2/3YEL/BLKIAT Input
C2/4WHTECT Input
C2/5REDHO2S 2 Signal Input
C2/6WHTHO2S 1 Signal Input
C2/7BLUFuel Tank Pressure Sensor Input
C2/8PNKHO2S 1 Heater Control
C2/9BRNSensor Ground
C2/10—Not Used
C2/11LT GRNTP Input
C2/12RED/WHTO/D Cut Signal (4-spd A/T)
C2/13BLKKnock Input
C2/14PNKHO2S 2 Heater Control
C2/15BLU/WHTDiagnostic Request
C2/16BRNGround
C3/1RED/WHTBattery Positive Voltage
C3/2BLKIdle Up Signal (Defoggers)
C3/3BLU/WHTIdle Signal Control (Cruise Control)
C3/4GRN/WHTBrake Signal
C3/5RED/YELMIL Control
C3/6 & 7—Not Used
C3/8BLKEngine Speed Output
C3/9PPL/WHTVSS Input
C3/10YEL/REDA/C ON Signal
C3/11BLK/WHTCrank Signal
C3/12BLKIgnition Positive Voltage
C3/13GRNIdle Up Signal (Taillights)
C3/14GRN/REDCircuit Opening Relay
C3/15—Not Used
C3/16WHTSerial Data Line
C3/17RED/BLKR Position Signal (4-spd A/T)
C3/18LT GRN/RED2 Position Signal (4-spd A/T)
C3/19LT GRN/BLKL Position Signal (4-spd A/T)
C3/20—Not Used
C3/21RED/BLUA/C Cut-Out Control
C3/22LT GRNO/D On/Off Signal (4-spd A/T)
(1) (Scheme 6)

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (1.8L)

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