Battery, Charging System and Starting System Chevrolet Colorado I

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool BCM Battery Voltage Signal parameter and the Batt. Voltage High Res. parameter. The readings for both parameters should be between 12.6 and 15.0 volts, and should be within 1.5 volts of each other.

Circuit/System Testing

Ignition OFF, disconnect the harness connectors at the GBCM.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground: Terminal F Terminal H If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground: Terminal A Terminal C If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the GBCM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for GBCM replacement, setup and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Generator Turn On Signal	B1487		B1488

DTC B1487

The generator battery control module (GBCM) controls the generator through the generator turn on signal circuit, or L-Terminal circuit. The signal is a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle when the engine is running is between 5-100 percent. If the generator turn on signal circuit is in the 0-5 percent range, or pulled low to ground, then DTC B1487 will set.

The engine is running.
This diagnostic shall run every 100 ms.

The generator turn on signal circuit is less than 5 percent duty cycle for 2 minutes.

The charge indicator turns ON.
The driver information center (DIC) displays the SERVICE CHARGE SYS message.

The DTC will pass when the generator turn on signal circuit input is greater than 5 percent duty cycle.
The charge indicator and DIC message will remain ON until the ignition switch is cycled after the DTC is cleared.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the harness connector at the generator.
Ignition ON, GEN L-Terminal Signal Command 0%, test for less than 1 volt between the generator turn on signal circuit terminal 1 X1 and ground. If greater than the specified range, test the generator turn on signal circuit for a short to voltage. If the circuit tests normal, replace the GBCM.
Command the GEN L-Terminal Signal ON to 80% duty cycle with a scan tool. Test for 3.0 volts between the generator turn on signal circuit terminal 1 X1 and ground. If less than the specified value, test the generator turn on signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the GBCM.
If the circuit tests normal, replace the generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for GBCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Generator Turn On Signal	B1487		B1488

DTC B1488

The generator battery control module controls the generator through the generator turn on signal circuit. The signal is a 5-volt pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is 0 percent when the engine is not running. If the generator turn on signal circuit is 65 percent or greater duty cycle, or shorted to voltage, then DTC B1488 will set.

The ignition is ON.
The engine is OFF.
This diagnostic runs every 100 ms.

The generator turn on signal circuit duty cycle is greater than 65 percent for 5 seconds.

The charge indicator turns ON.
The driver information center (DIC) displays the SERVICE CHARGE SYS message.

The DTC will pass when the conditions for setting the DTC are no longer present.
The charge indicator and DIC message will remain ON until the ignition is cycled after clearing the DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the harness connector at the generator.
Ignition ON, test for less than 1 volt between the generator turn on signal circuit terminal 1 X1 and ground. If greater than the specified range, test the generator turn on signal circuit for a short to voltage. If the circuit tests normal, replace the GBCM.
Engine Running, test for greater than 3 volts between the generator turn on signal circuit terminal 1 X1 and ground. If less than the specified range, test the generator turn on signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the GBCM.
If the circuit tests normal, replace the generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for GBCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Generator Field Duty Cycle Signal	B1492	B1492

DTC B1492

Typical Scan Tool Data

Circuit	Short to ground	Open	Short to voltage
Operating Conditions: Engine Running. Parameter Normal Range: 5% to 99%
Generator Field Duty Cycle Signal	0%	0%	99%

GEN F-Terminal Signal - ECM

The generator battery control module (GBCM) monitors the generator through the generator field duty cycle signal circuit. The signal is a pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 5-99 percent when the engine is running. If the generator field duty cycle signal circuit is in the 0-5 percent range or pulled low to ground while the engine is running, then DTC B1492 will set.

The engine is running.
The engine speed is less than 1,000 RPM.
DTC B1487 or B1488 is not set as a current DTC.
This diagnostic shall be run every 100 ms.

The generator field duty cycle signal circuit is less than 5 percent duty cycle for 2 minutes.

The charge indicator turns ON.
The driver information center (DIC) displays the SERVICE CHARGE SYS message.

The DTC passes when the generator field duty cycle signal circuit input is greater than 5 percent duty cycle.
You must cycle the ignition after clearing the DTC to turn OFF the indicator and DIC message.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Engine running, observe the scan tool ECM GEN-F Terminal Signal parameter. The parameter should read greater than 5 percent. If not within the specified range, refer to ECM Field Duty Cycle Signal Circuit Malfunction below.
Verify that the GBCM does not set DTC B1492. If the GBCM sets DTC B1492, refer to GBCM Field Duty Cycle Signal Circuit Malfunction below.

ECM Field Duty Cycle Signal Circuit Malfunction

Ignition OFF, disconnect the X1 harness connectors at the generator and GBCM.
Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter is 0 percent. If greater than the specified value, test the field duty cycle signal circuit terminal 2 X1 for a short to voltage. If the circuit tests normal, replace the ECM.
Connect a test lamp between the field duty cycle signal circuit terminal 2 X1 of the generator harness and B+. Verify the scan tool ECM GEN-F Terminal Signal parameter is greater than 95 percent. If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
Reconnect the GBCM harness connector. Disconnect the test lamp.
Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter is 0 percent. If greater than the specified value, replace the GBCM.
Connect a test lamp between the field duty cycle circuit terminal 2 X1 of the generator harness and B+. Verify the scan tool ECM GEN-F Terminal Signal parameter is greater than 95 percent. If less than the specified range, replace the GBCM.
If the circuit tests normal, replace the generator.

GBCM Field Duty Cycle Signal Circuit Malfunction

Ignition OFF, disconnect the GBCM harness connector.
Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter is 0 percent. If greater than the specified value, test the field duty cycle signal circuit terminal B for a short to voltage.
Connect a test lamp between the field duty cycle signal circuit terminal B and B+. Verify the scan tool ECM GEN-F Terminal Signal parameter is greater than 95 percent. If less than the specified range, test the circuit for a short to ground or an open/high resistance.
If the circuit tests normal, replace the GBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for GBCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The generator battery control module (GBCM) monitors its internal battery current sensor for many charging system operations. If the battery current sensor signal is out of range, DTC B1516 will set.

The ignition is ON.
This diagnostic runs every 50 ms.

The duty cycle of the internal battery current sensor is less than 2 percent duty cycle or greater than 98 percent duty cycle for 4 minutes.

The charge indicator turns ON.
The driver information center (DIC) displays the SERVICE CHARGE SYS message.

The DTC will pass when the duty cycle of the internal battery current sensor is between 2 percent and 98 percent duty cycle.
You must cycle the ignition after clearing the DTC to turn OFF the DIC message and charge indicator.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, headlamps and all accessories OFF, observe the scan tool BCM Battery Current parameter. The reading should be between -30 amps and 30 amps, and change with the amount of current draw on the battery.

Replace the GBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for GBCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The generator battery control module (GBCM) monitors its internal battery current sensor for many charging system operations, and also for diagnostic purposes. If reversed polarity of the battery current is sensed, then DTC B151B will set.

The engine is not running.
DTC B1516 is not set.

The GBCM detects positive battery current.

The regulated voltage control (RVC) is disabled.

The GBCM detects correct polarity of the battery current.

DTC B151B may set if a battery charger is used.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that the GBCM is installed correctly. The GBCM should be installed on the negative battery cables, with the sensor coil around the negative cables and facing away from the battery, and with the harness connector facing toward the battery. If the GBCM is installed backwards or incorrectly, remove and reinstall the GBCM.
Ignition ON, clear the DTC with the scan tool. Verify that DTC B151B does not set. If the DTC sets, replace the GBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for GBCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine is not running.
DTC B1516 is not set.

The GBCM detects positive battery current.

The regulated voltage control (RVC) is disabled.

This DTC passes when the GBCM detects correct polarity of the battery current.

DTC B1566 may set if a battery charger is used.

Schematic Reference

Connector End View Reference

Description and Operation

Antilock Brake System Schematics

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that the GBCM is installed correctly. The GBCM should be installed on the negative battery cables, with the sensor coil around the negative cables and facing away from the battery, and with the harness connector facing toward the battery. If the GBCM is installed backwards or incorrectly, remove and reinstall the GBCM.
Ignition ON, clear the DTC with the scan tool. Verify that DTC B1566 does not set. If the DTC sets, replace the GBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for GBCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	C0899	C0899
Ground		C0899

DTC C0899

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.60 Volts
B+	0.00 Volts	0.00 Volts	12.60 Volts

Battery Voltage - EBCM

The electronic brake control module (EBCM) monitors the ignition voltage level available for system operation. A low voltage condition prevents the system from operating properly.

The ignition is ON.

The EBCM detects that the battery voltage is less than 9 volts for 100 msec.

The antilock brake system (ABS), traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle.
The ABS and TCS indicators turn ON.
The DIC displays the SERVICE STAB SYS message, if equipped.

The DTC passes when the condition for the DTC is no longer present.
The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Connector End View Reference

ABS Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool EBCM Battery Voltage parameter. The reading should be between 12.60 and 15.00 volts.

Ignition OFF, disconnect the harness connector at the EBCM.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground: Terminal 2 Terminal 3 If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground: Terminal 1 Terminal 4 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 21 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming.

Diagnostic Information

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition 1 Signal	C0901	C0901
Ground		C0901

DTC C0901

The electronic brake control module (EBCM) monitors the ignition 1 voltage (IGN1) level available for system operation. A low voltage condition prevents the system from operating properly.

The ignition is ON.

Ignition 1 (IGN1) voltage to the EBCM is less than 6.5 volts for 7 seconds.
Vehicle speed is greater than 3 km/h (2 mph).

The brake warning indicator turns ON.

The DTC passes when the condition for the DTC is no longer present.
The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

ABS Description and Operation

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool EBCM Battery Voltage parameter. The reading should be between 12.60 and 15.00 volts.

Ignition OFF, disconnect the harness connector at the EBCM.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground: Terminal 2 Terminal 3 If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground: Terminal 1 Terminal 4 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 21 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0562	P0562
Ground		P0562

DTC P0562

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.6 Volts
B+	0.0 Volts	0.0 Volts	12.6 Volts

Ignition 1 Signal - ECM

The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.

The vehicle speed is above 8 km/h (5 mph).
The system voltage is between 9.5-18 volts.

The ECM detects a system voltage less than 10 volts for 5 seconds.

DTC P0562 is a type C DTC.

Schematic Reference

«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references)
«Starting and Charging Schematics»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.0 volts.

Ignition OFF, disconnect the harness connectors at the ECM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the B+ circuit terminals and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+	P0562	P0562
Ground		P0562

DTC P0563

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.6 Volts
B+	0.0 Volts	0.0 Volts	12.6 Volts

Ignition 1 Signal - ECM

The vehicle speed is above 8 km/h (5 mph).
The system voltage is between 9.5-18 volts.

The ECM detects battery voltage greater than 16 volts for 1 second.

DTC P0563 is a type C DTC.

Schematic Reference

«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references)
«Starting and Charging Schematics»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

This DTC could be set by overcharging with a battery charger or jump starting.
A high voltage value in multiple modules indicates a concern in the charging system.

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts. If not within the specified range, refer to «Charging System Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.0 volts. If greater than the specified range, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Starter Relay Control	P0615	P0615	P0615
Ground		P0615

DTC P0615

When the ignition switch is placed in the start position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the start position. The BCM then sends a message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the clutch is pressed for the manual transmission or that the automatic transmission is in park or neutral. If it is, the ECM then supplies 12 volts to the control circuit of the STRTR relay. When this occurs, battery voltage is supplied through the switch of the STRTR relay to terminal A X1 of the starter solenoid.

The ignition is ON.
The system voltage is between 9.5-18 volts.

The ECM detects improper voltage on the control circuit of the starter relay for 2 seconds.

DTC P0615 is a type C DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON. Verify that no theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable engine starting. If any DTCs are set that would cause the ECM to disable starting, then refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
Clear the DTCs. Attempt to start the engine. The engine should crank and DTC P0615 should not set.

Ignition OFF, disconnect the STRTR relay.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the relay ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85. Turn the ignition to the start position. The test lamp should turn ON for no longer than 10 seconds when the ignition is in the start position, and OFF in all other positions. If the test lamp is always on, test the control circuit for short to voltage. If the circuit tests normal, replace the ECM. If the test lamp is always off, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the STRTR relay.

Component Testing

STRTR Relay

Ignition OFF, disconnect the STRTR relay.
Test for 60-180 ohms between terminals 85 and 86 of the relay. If not within the specified range, replace the STRTR relay.
Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
Install a 20 amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87 of the relay. If greater than specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Relay Replacement (Attached to Wire Harness)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Generator Field Duty Cycle Signal	P0622	P0622	P0622

DTC P0622

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Engine running. Parameter Normal Range: 5 - 99%
Generator Field Duty Cycle Signal	0%	0%	99%

GEN-F Terminal Signal - ECM

Circuit Description

The engine control module (ECM) uses the generator field duty cycle signal circuit to monitor the duty cycle of the generator. The generator field duty cycle signal circuit connects to the high side of the field winding in the generator. A pulse width modulated (PWM) high side driver in the voltage regulator turns the field winding ON and OFF. The ECM uses the PWM signal input to determine the generator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads.

The ECM monitors the state of the generator field duty cycle signal circuit. When the key is in the RUN position and the engine is OFF, the ECM should detect a duty cycle near 0 percent. However, when the engine is running, the duty cycle should be between 5 percent and 100 percent. The ECM monitors the PWM signal using a key ON test and a RUN test. During the tests, if the ECM detects an out of range PWM signal, DTC P0622 will set.

No generator, crankshaft position (CKP) sensors, or camshaft position (CMP) sensor DTCs are set.
The ignition is ON.

Ignition ON engine OFF, the ECM detects a PWM signal greater than 65 percent for 5 seconds
Engine running, the ECM detects a PWM signal less than 5 percent for 15 seconds.

DTC P0622 is a type C DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, engine OFF, observe the scan tool ECM GEN-F Terminal Signal parameter. The parameter should read 0 percent.
Engine running, observe the scan tool ECM GEN-F Terminal Signal parameter. The parameter should read between 5 and 99 percent.

Ignition OFF, disconnect the X1 harness connectors at the generator and GBCM.
Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter is 0 percent. If greater than the specified value, test the field duty cycle signal circuit terminal 2 X1 for a short to voltage. If the circuit tests normal, replace the ECM.
Connect a test lamp between the field duty cycle signal circuit terminal 2 X1 of the generator harness and B+. Verify the scan tool ECM GEN-F Terminal Signal parameter is greater than 95 percent. If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
Reconnect the GBCM harness connector. Disconnect the test lamp.
Ignition ON, verify the scan tool ECM GEN-F Terminal Signal parameter is 0 percent. If greater than the specified value, replace the GBCM.
Connect a test lamp between the field duty cycle circuit terminal 2 X1 of the generator harness and B+. Verify the scan tool ECM GEN-F Terminal Signal parameter is greater than 95 percent. If less than the specified range, replace the GBCM.
If the circuit tests normal, replace the generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Generator Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming.

Symptoms - Engine Electrical

IMPORTANT

The following steps must be completed before using the symptom tables.

Perform «Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
Review the system descriptions and operations in order to familiarize yourself with the system functions. Refer to one of the following system operations: «Battery Description and Operation»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) «Charging System Description and Operation»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) «Electrical Power Management Description and Operation»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) «Starting System Description and Operation»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__starting-system-description-and-operation)

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the starting and charging systems. Refer to «Checking Aftermarket Accessories»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

«Battery Inspection/Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Battery Electrical Drain/Parasitic Load Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Battery Common Causes of Malfunction»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__battery-common-causes-of-malfunction)
«Charging System Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Generator Noise Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Starter Solenoid Does Not Click (Automatic M30)»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Solenoid Does Not Click (Manual MA5)»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Starter Solenoid Clicks, Engine Does Not Crank»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Engine Cranks Slowly»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__engine-cranks-slowly)
«Starter Motor Noise Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)

Special Tools

J 42000 Battery Tester. See Special Tools .

CAUTION

Refer to Battery Disconnect Caution .

IMPORTANT

The battery test using the J 42000 Battery Tester requires correct connections to the battery terminals. See Special Tools . A failure to obtain the correct connections during the test may result in a failed test on a good battery. Use the Out of Vehicle test for each battery when testing a vehicle with dual batteries.

Follow these instructions in order to avoid an incorrect diagnosis because of connections

If testing the vehicle with the battery cables still connected, wiggle the J 42000 clips on the terminal bolt. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . This may cut through any coating or through any oxidation that may be present on the bolt. Even new bolts contain a protective coating that may insulate or cause a resistance in the test circuit.
If correct connections to the battery terminal bolts in the vehicle are in doubt, perform the following steps: Disconnect the negative battery cable. Disconnect the positive battery cable. Install the test adapters on the terminals. Follow the instructions for testing a removed battery.
If the tester displays a REPLACE BATTERY or BAD CELL-REPLACE result for a battery tested in the vehicle with the battery cables connected, perform the following steps: Disconnect the negative battery cable. Disconnect the positive battery cable. Install the tester adapters. IMPORTANT: Always write the test code displayed by the tester on the repair order for any warranty purposes. The number is a unique code that describes the test data for a particular battery at a particular time. The test code may occasionally repeat when you retest the same battery. More often, each test will result in a different code. Use the test code from the second, or Out of Vehicle test. Follow the instructions for testing a removed battery. Replace the battery only if the second test shows a REPLACE BATTERY or BAD CELL-REPLACE result. Use the test code from the second test for any warranty purposes.
Use the correct terminal adapters. Do not use any common bolts or a combination of bolts, of nuts, and of washers as adapters when testing the battery. Use the test adapters that are provided with the J 42000 or GM P/N 12303040 terminal adapters. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . If the adapters that are provided with the J 42000 require replacement, use GM P/N 12303040. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . Any other adapter may not contact the correct areas of the battery terminal, causing a resistance that may result in an invalid battery test result.

CAUTION

Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

Inspect the battery for a cracked, broken, or damaged case, which may be indicated by battery acid leakage. If there is any apparent damage, replace the battery.
Verify the cold cranking amperage (CCA), and reserve capacity (RC) and/or amp hour (AH) rating of the battery to the original battery or original equipment (OE) specification. Refer to «Battery Usage»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__battery-usage) . If the battery does not meet or exceed specifications, replace the battery.
Verify that the battery cables are clean and tight. The battery terminal bolts should be torqued as specified in «Fastener Tightening Specifications»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__fastener-tightening-specifications) . If the battery cable(s) need to be cleaned, clean as required and tighten as specified. If the battery cable(s) are damaged, replace then tighten as specified.
Install the J 42000 and follow directions supplied by the tester. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . If the tester calls for charging the battery, refer to «Battery Charging»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Battery Positive and Negative Cable Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__battery-positive-and-negative-cable-replacement)
«Battery Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)

J 42000 Battery Tester. See Special Tools .

For best results, use an automatic taper-rate battery charger with a voltage capability of 16 volts.
The charging area should be well ventilated.
Do not charge a battery that appears to be frozen. Allow the battery to warm to room temperature and test it using the J 42000 before charging. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

Battery State of Charge

IMPORTANT

Using voltage to determine the batteries state of charge (SOC) is only accurate after the battery has been at rest for 24 hours. This is enough time for the acid in each cell to equalize. If the battery has been charged or discharged in the past 24 hours, the battery SOC will only be an estimate.

The maintenance-free batteries SOC is estimated by reading the voltage of the battery across the battery terminals. Because the voltage is affected by current flow into or out of the battery, the engine must be stopped and all electrical loads turned OFF, including parasitic loads, when checking the voltage. The voltage can also be affected if the battery has just been charged or discharged, so it is important to consider what has happened to the battery in the time just before testing. Use the following procedure to determine the batteries SOC

Be sure all electrical loads are turned OFF.
Determine whether the battery has been used in a vehicle or charged within the past 12 hours. If the answer is no, the terminal voltage will be stabilized and no action is necessary before reading the voltage. Skip to step 3. If the answer is yes, terminal voltage will not be stabilized and you should wait 12 hours since the last time the battery was used.
Estimate the battery temperature by determining the average temperature to which the battery has been exposed for the past 12 hours.
Measure the battery voltage at the battery terminals. Refer to the following table to determine the SOC according to the estimated battery temperature

Battery Voltage	% Charge at 0°C (32°F)	% Charge at 25°C (75°F)
12.75 V	100%	100%
12.7 V	100%	90%
12.6 V	90%	75%
12.45 V	75%	65%
12.2 V	65%	45%
12.0 V	40%	20%

Battery Charging

Use the SOC information as follows

A battery with a SOC that is below 65 percent must always be recharged before returning it to service or continuing storage.
A battery with a SOC that is 65 percent or greater is generally considered to be charged enough in order to be returned to normal service or in order to continue storage. However, if the battery is being used in slow traffic or with short drive times, or if the temperature is very hot or very cold, the battery should be fully charged, to at least 90 percent, before returning it to service or continuing storage.

Charging Time Required

The time required to charge a battery will vary depending upon the following factors

The battery charger capacity-The higher the charger amperage, the less time it will take to charge the battery.
The SOC of the battery-A completely discharged battery requires more than twice as much charging time as a half charged battery. In a discharged battery with a voltage below 11 volts, the battery has a very high internal resistance and may only accept a very low current at first. Later, as the charging current causes the acid content to increase in the electrolyte, the charging current will increase. Extremely discharged batteries may not activate the reversed voltage protection in some chargers. Refer to the manufacturer's instructions for operating this circuitry.
The temperature of the battery-The colder the battery is, the more time it takes to recharge the battery. The charging current accepted by a cold battery is very low at first. As the battery warms, the charging current will increase.

Charging Procedure

Note. Turn OFF the ignition when connecting or disconnecting the battery cables, the battery charger or the jumper cables. Failure to do so may damage the ECM/PCM or other electronic components.

Note. Refer to Fastener Notice .

When charging side-terminal batteries with the battery cables connected, connect the charger to the positive cable bolt and to a ground located away from the battery. When charging side-terminal batteries with the battery cables disconnected, install the battery side terminal adapters and connect the charger to the adapters.

Tighten: Tighten the battery side terminal adapters to 15 N.m (11 lb ft).

Use the following procedure to charge the battery

Turn OFF the charger.
Ensure that all of the battery terminal connections are clean and tight.
Connect the charger positive lead to the battery positive terminal on the battery or the remote jumper stud underhood.
Connect the negative charger lead to a solid engine ground or to a ground stud in the engine compartment that is connected directly to the battery negative terminal, but away from the battery. If the negative battery cable is disconnected and a terminal adapter is being used, connect directly to the adapter.
Turn ON the charger and set to the highest setting for normal charging.
Inspect the battery every half hour after starting the battery charger. Charge the battery until the taper-rate charger indicates that the battery is fully charged. Estimate the battery temperature by feeling the side of the battery. If it feels hot to the touch or its temperature is over 45°C (125°F), discontinue charging and allow the battery to cool before resuming charging.
After charging, test the battery. Refer to «Battery Inspection/Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .

J 38758 Parasitic Draw Test Switch. See Special Tools .

Be sure to rule out any possible obvious influences, such as customer error or aftermarket equipment.
Customer driving habits, such as regular short trips. This does not allow enough time to properly charge the battery. Refer to «Battery Description and Operation»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Verify that the battery and charging system are in proper working order. Refer to «Battery Charging»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) and «Charging System Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
A battery discharging for no apparent reason while the vehicle is parked can be caused by an intermittent draw, such as a module waking up, or a continuous draw, such as a dome light or stuck relay.
Some systems and modules such as OnStar®, and regulated voltage control (RVC), if equipped, are designed to wake-up, perform a task, and go back asleep at regular intervals. Refer to «Body Control System Description and Operation»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#data-communication-system) for the system or modules description and operation.
Remote keyless entry (RKE) will wake up due to an outside input. Refer to «Keyless Entry System Description and Operation»(/chevrolet/colorado/i-2004-2012/remont/door-locks-anti-theft-systems/#keyless-entry-system-remote-functions__keyless-entry-system-description-and-operation) for the system description and operation.
The battery run down time will vary depending on cold cranking amperage (CCA) and reserve capacity (RC). If the CCA and RC are higher, then the battery run down time would be longer. If the CCA and RC are lower, then the battery run down time would be shorter. The graph below indicates roughly how many days a 690 CCA battery with at 110 min. RC (60.5 AH) starting at 80 percent state of charge will last with a constant current draw until it reaches 50 percent state of charge. Differences in battery rating and temperature will affect the results.

Current Drain	Days
25 mA	30.5
50 mA	16.5
75 mA	11
100 mA	8.25
250 mA	3.3
500 mA	1.65
750 mA	1
1 A	0.8
2 A	0.4

Battery Electrical Drain/Parasitic Load Test

Load Test

CAUTION

Refer to Battery Disconnect Caution .

Note. Do not turn the parasitic draw test switch to the OFF position with the engine running. Damage will occur to the vehicle's electrical system.

Note. The test switch must be in the ON position when removing the fuses in order to maintain continuity in the electrical system. This avoids damaging the digital multimeter due to accidental overloading, such as a door being opened to change a fuse.

IMPORTANT

The test switch on the J 38758 is marked ON and OFF. See Special Tools . When the test switch is in the ON position, the circuit is closed and electrical current will pass through the switch. When the test switch is in the OFF position, the circuit is open and electrical current will not pass through the switch.

Disconnect the battery negative cable from the battery negative terminal. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Install the male end of the J 38758 to the battery ground terminal. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Install the battery negative cable to the female end of the J 38758 . See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Turn the J 38758 test switch to the ON position. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Road test the vehicle and activate ALL of the accessories, including the radio and air conditioning. This may take up to 30 minutes.
Park the vehicle. Turn the ignition switch to the OFF position and remove the ignition switch key.
Connect a 10A fused jumper wire to the test switch tool terminals.
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . The current now flows through the jumper wire.
Wait 1 minute. If the fuse blows, install an inductive ammeter to locate the current draw.
Turn the test switch to ON and then remove the fused jumper wire.
Set a digital multimeter to the 10A scale.
Connect the digital multimeter to the test switch tool terminals.
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . The current flows now through the digital multimeter.
Wait 1 minute. Check and record the current reading. When there is a current reading of 2A or less, turn the J 38758 test switch to the ON position. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . The electrical current will now pass through the switch. Then switch the digital multimeter down to the 2A scale for a more accurate reading when the J 38758 test switch is turned OFF. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Turn the J 38758 test switch to the OFF position. See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) . Wait up to 45 minutes for most vehicles.
Check and record the current reading.
Note the battery reserve capacity, amp hour rating. Refer to «Battery Usage»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__battery-usage) . Divide the reserve capacity by 4, amp hour rating by 2.4. Compare this to the multimeter milliampere reading taken in the previous step. The parasitic current drain should not exceed this number. Example: If a battery has a reserve capacity of 100 minutes, (60 A/H) the current drain should not exceed 25 mA.
If excessive current drain is not found at this time and there are no other apparent causes, complete the following: Using the MIN/MAX function of the digital multimeter, monitor the parasitic drain overnight or during the day. This will determine if something has been activated during that time frame. NOTE: The test switch must be in the ON position when removing the fuses in order to maintain continuity in the electrical system. This avoids damaging the digital multimeter due to accidental overloading, such as a door being opened to change a fuse. IMPORTANT: Removing fuses, relays, and connectors to determine the failure area may wake up modules. You must wait for these modules to go to sleep or use the sleep function on the scan tool. When the vehicle has an unacceptable amount of parasitic current drain, remove each fuse one at a time until the current drain falls to an acceptable level. This will indicate which circuit is causing the drain. Refer to «Power Distribution Schematics»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) to diagnose exactly which part of the suspect circuit is causing the parasitic drain. In some cases a non-fused circuit or component, such as a relay, is the cause of excessive parasitic current drain. Repeat the parasitic current drain test procedure after any repair has been completed to make sure that the parasitic current drain is at an acceptable level. When the cause of the excessive current drain has been located and repaired, remove the J 38758 . See «Special Tools»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Connect the battery negative cable to the battery negative terminal.

Battery Common Causes of Malfunction

A battery is not designed to last forever. With proper care, however, the battery will provide years of good service. If the battery tests good but still fails to perform well, the following are some of the more common causes

A vehicle accessory was left on overnight.
The driving speeds have been slow with frequent stops, stop-and-go driving, with many electrical accessories in use, particularly air conditioning, headlights, wipers, heated rear window, cellular telephone, etc.
The electrical load has exceeded the generator output, particularly with the addition of aftermarket equipment.
Existing conditions in the charging system, including the following possibilities: A slipping belt A bad generator
The battery has not been properly maintained, including a loose battery hold down or missing battery insulator if used.
There are mechanical conditions in the electrical system, such as a short or a pinched wire, attributing to power failure. Refer to «General Electrical Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis) .

Electrolyte Freezing

The freezing point of electrolyte depends on its specific gravity. A fully charged battery will not freeze until the ambient temperature gets below -54°C (-65°F). However, a battery with a low state of charge may freeze at temperatures as high as -7°C (20°F). Since freezing may ruin a battery, the battery should be protected against freezing by keeping it properly charged above 80 percent state of charge, the freezing point of the battery will be somewhere below -32°C (-25°F).

Battery Protection During Vehicle Storage

Certain devices on the vehicle maintain a small continuous current drain, parasitic load, on the battery. A battery that is not used for an extended period of time will discharge. Eventually permanent damage will result. Discharged batteries will also freeze in cold weather. Refer to Battery Inspection/Test .

In order to maintain the battery state of charge while storing the vehicle for more than 30 days

CAUTION

Refer to BATTERY DISCONNECT CAUTION .

Disconnect the battery ground cable to protect the battery from discharge by parasitic current drains.

When the battery cannot be disconnected

Maintain a high state of charge.
Establish a regular schedule for recharging the battery every 20-45 days.

A battery that has remained in a discharged state for a long period of time is difficult to recharge or may be permanently damaged.

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Description and Operation

Testing for Intermittent Conditions and Poor Connections

Electrical Information Reference

Engine ON, observe the charge indicator on the instrument panel cluster (IPC) or message in the driver information center (DIC). The charge indicator on the IPC should be turned OFF and the DIC should not display charging system message.

If the charge indicator is not on the IPC or a charging system message is not displayed on the DIC, refer to «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor) .

If the charge indicator is on the IPC or a charging system message is displayed on the DIC, refer to Circuit/System Testing below.

Ignition ON, verify that no generator or battery current sensor DTCs are set that would cause a charging system concern. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
Ignition OFF, measure the voltage across the battery terminals. The voltage should read 12.0 volts or greater at room temperature. If not within specified value, refer to «Battery Inspection/Test»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
Connect a carbon pile tester to the battery.
Start the engine and increase the engine speed to 2,500 RPM. Observe the voltage reading on the tester. The voltage should read between 12.6-15.0 volts. If not within specified range, replace the generator.
Adjust the carbon pile tester to the specified load test output value, refer to «Generator Usage»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system__generator-usage) . If not within specified value, replace the generator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Generator Replacement

Noise from a generator may be due to electrical or mechanical noise. Electrical noise, magnetic whine, usually varies with the electrical load placed on the generator and is a normal operating characteristic of all generators. When diagnosing a noisy generator, it is important to remember that loose or misaligned components around the generator may transmit the noise into the passenger compartment and that replacing the generator may not solve the problem.

Step	Action	Yes	No
1	Test the generator for proper operation using the Generator Tester. Refer to Charging System Test . Is the generator operating properly?	Go to Step 2	Go to Step 11
2	Start the engine. Verify that the noise can be heard. Turn OFF the engine. Disconnect the 4-way connector from the generator. Start the engine. Listen for the noise. Has the noise stopped?	Go to Step 11	Go to Step 3
3	Turn OFF the engine. Remove the drive belt. Refer to Drive Belt Replacement for the 2.9 L engine or Drive Belt Replacement for the 3.7 L engine. Spin the generator pulley by hand. Does the generator shaft spin smoothly and without any roughness or grinding noise?	Go to Step 4	Go to Step 11
4	Inspect the generator for a loose pulley and/or pulley nut. Is the generator pulley or pulley nut loose?	Go to Step 11	Go to Step 5
5	Loosen all of the generator mounting bolts. Tighten the generator mounting bolts to specifications and in the proper sequence, if necessary. Refer to Generator Replacement . Install the drive belt. Refer to Drive Belt Replacement for the 2.9 L engine or Drive Belt Replacement for the 3.7 L engine. Start the engine. Has the noise decreased or stopped?	System OK	Go to Step 6
6	Inspect the generator for the following conditions: Strained or stretched electrical connections Hoses or other vehicle equipment resting on the generator, which may cause the noise to be transmitted into the passenger compartment Are any electrical connections pulling on the generator or are any hoses, etc. resting on the generator?	Go to Step 7	Go to Step 8
7	Reroute the electrical connections to relieve the tension. Reroute the hoses, etc. away from the generator. Start the engine. Has the noise decreased or stopped?	System OK	Go to Step 8
8	Inspect the drive belt for proper tension. Refer to Drive Belt Tensioner Diagnosis for the 2.9 L engine or Drive Belt Tensioner Diagnosis for the 3.7 L engine. Is the drive belt loose?	Go to Step 9	Go to Step 10
9	Replace the drive belt tensioner. Refer to Drive Belt Tensioner Replacement for the 2.9 L engine or Drive Belt Tensioner Replacement for the 3.7 L engine. Start the engine. Has the noise decreased or stopped?	System OK	Go to Step 11
10	Compare the vehicle with a known good vehicle. Do both vehicles make the same noise?	System OK	Go to Step 11
11	IMPORTANT: If no definite generator problems were found, be sure that all other possible sources of objectionable noise are eliminated before replacing the generator. Replacing the generator may not change the noise level if the noise is a normal characteristic of the generator or the generator mounting. Replace the generator. Refer to Generator Replacement .Has the noise decreased or stopped?	Go to Step 12
12	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2

IMPORTANT
If no definite generator problems were found, be sure that all other possible sources of objectionable noise are eliminated before replacing the generator. Replacing the generator may not change the noise level if the noise is a normal characteristic of the generator or the generator mounting.

Generator Noise Diagnosis

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
ECM Park Neutral Signal	2	1	1
Relay Control Circuit (terminal 86)	1	1	3
Relay Coil Ground Circuit (terminal 85)		1
Relay Control Output Circuit (terminal 87)	1	1	3
B+ Circuit (terminal 30)	1	1
No crank Cranks in any gear Cranks all the time

Starter Solenoid Does Not Click (Automatic M30)

When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then provides 12 volts to energize the Run/Crank relay. The Run/Crank relay sends a 12 volt signal to the ECM that crank has been requested. The ECM then verifies that the transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the STRTR relay. When this occurs, battery voltage is supplied through the switch of the STRTR relay to S terminal of the starter solenoid.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify that no starter relay, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable starting. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
Ignition ON, observe the scan tool ECM Crank Request Signal parameter. Place ignition switch in the crank position, the parameter should display Yes. If not the specified value, refer to «Power Mode Mismatch»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis) .
Transmission range selector in park, verify the scan tool ECM PNP Switch parameter displays Park/Neutral. If the ECM PNP Switch parameter does not indicate Park/Neutral. Refer to ECM Park Switch Circuit Malfunction below.
Transmission range selector in park or neutral, attempt to start the vehicle. The starter relay should click and the engine should begin cranking. If the crank relay does not click or the engine does not crank, refer to Starter Relay Circuit Malfunction below.

Starter Relay Circuit Malfunction

Ignition OFF, disconnect the starter relay.
Test for less than 1 ohm of resistance between the ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the relay switch B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ensure the parking brake is applied and the transmission is in PARK. Momentarily install a 40 A fused jumper wire between the B+ circuit terminal 30 and the control output circuit terminal 87. The starter solenoid should engage and the engine should begin cranking. If the solenoid does not engage, test the control output circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the starter motor.
Connect a test lamp between the coil control circuit terminal 86 and the coil ground circuit terminal 85.
With the transmission range selector in park or neutral, cycle the ignition key between the OFF and CRANK position. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the starter relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Relay Replacement (Attached to Wire Harness)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
«Park/Neutral Position and Backup Lamp Switch Replacement»(/chevrolet/colorado/i-2004-2012/remont/automatic-trans/#how-to-overhaul-the-automatic-transmission-4l60-e4l65-e4l70-e-removal-installation-service-troubleshooting-diagnosis)
«Starter Motor Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
ECM Park Neutral Signal	2	1	1
Relay Control Circuit (terminal 86)	1	1	3
Relay Coil Ground Circuit (terminal 85)		1
Relay Control Output Circuit (terminal 87)	1	1	3
B+ Circuit (terminal 30)	1	1
No crank Cranks in any gear Cranks all the time

Starter Solenoid Does Not Click (Manual MA5)

When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then provides 12 volts to energize the Run/Crank relay. The Run/Crank relay sends a 12 volt signal to the ECM that crank has been requested. The ECM then verifies that the transmission is in neutral and the clutch pedal is fully depressed. If it is, the ECM then supplies 12 volts to the control circuit of the STRTR relay. When this occurs, battery voltage is supplied through the switch of the STRTR relay to S terminal of the starter solenoid.

Electrical Information Reference

«Circuit Testing»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
«Connector Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Control Module References for scan tool information

Ignition ON, verify that no starter relay, theft deterrent, or clutch pedal DTCs are set that would cause the ECM to disable starting. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
Ignition ON, observe the scan tool ECM Crank Request Signal parameter. Place ignition switch in the crank position, the parameter should display Yes. If not the specified value, refer to «Power Mode Mismatch»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis) .
With the transmission in neutral and clutch fully depressed, verify the scan tool ECM Clutch Start Switch parameter displays Applied. If the ECM Clutch Start Switch parameter does not indicate Applied, refer to «Clutch Pedal Position Sensor Learn»(/chevrolet/colorado/i-2004-2012/remont/manual-trans/#manual-transmission-aisin-ar5__clutch-pedal-position-sensor-learn) .
With the transmission in neutral and clutch fully depressed, attempt to start the vehicle. The starter relay should click and the engine should begin cranking. If the STRTR relay does not click or the engine does not crank, refer to Starter Relay Circuit Malfunction below.

Starter Relay Circuit Malfunction

Ignition OFF, disconnect the starter relay.
Test for less than 1 ohm of resistance between the ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify a test lamp illuminates between the relay switch B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ensure the parking brake is applied and the transmission is in neutral. Momentarily install a 40 A fused jumper wire between the B+ circuit terminal 30 and the control output circuit terminal 87. The starter solenoid should engage and the engine should begin cranking. If the solenoid does not engage, test the control output circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the starter motor.
Connect a test lamp between the coil control circuit terminal 86 and the coil ground circuit terminal 85.
With the transmission in neutral and the clutch pedal fully depressed, cycle the ignition key between the OFF and CRANK position. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the starter relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Relay Replacement (Attached to Wire Harness)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/colorado/i-2004-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
«Starter Motor Replacement»(/chevrolet/colorado/i-2004-2012/remont/charging-system/#battery-charging-system-and-starting-system)
«Control Module References»(/chevrolet/colorado/i-2004-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup and programming

Perform the «Diagnostic System Check - Vehicle»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/chevrolet/colorado/i-2004-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the engine control module (ECM) that crank has been requested. The ECM then verifies that the transmission is in Park or Neutral, or that the clutch pedal is pressed. If it is, the ECM then supplies 12 volts to the control circuit of the STRTR relay. When this occurs, battery voltage is supplied through the switch of the STRTR relay to terminal A X1 of the starter solenoid.