DTC B0560. Chevrolet TrailBlazer

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2007 🢒 TrailBlazer - 4WD 🢒 Driver Information and Entertainment 🢒 Displays and Gages 🢒 DTC B0560

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	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
Engine Speed Signal Circuit	B0560	B0560	B0560	--

The instrument panel cluster (IPC) receives the engine speed information from the engine control module (ECM)/powertrain control module (PCM) through the engine speed signal circuit. The ECM/PCM converts the data from the engine speed sensor to a 2 pulses/(engine revolution) signal. The ECM/PCM also sends a class 2 message to the IPC indicating the engine speed. If the IPC determines there is a loss of the engine speed signal from the ECM/PCM due to a engine speed signal circuit malfunction, a DTC sets.

Conditions for Running the DTC

•	The engine speed is greater than 800 RPM.

•	The ignition voltage is greater than 9 volts, but less than 18 volts.

Conditions for Setting the DTC

•	The IPC detects that the engine speed signal circuit does not match the engine speed from the class 2 serial data circuit.

•	The above condition is present for at least 5 seconds.

Action Taken When the DTC Sets

The IPC stores the DTC in memory.

Conditions for Clearing the DTC

•	A last test failed (current DTC) clears when the diagnostic runs and does not fail.

•	A history DTC clears after 100 consecutive malfunction-free warm-up cycles.

•	The IPC receives the clear code command from the scan tool.

Reference Information

Schematic Reference

•	Instrument Cluster Schematics

•	Engine Controls Schematics for the 4.2L engine

•	Engine Controls Schematics for the 5.3L engine

•	Engine Controls Schematics for the 6.0L engine

Connector End View Reference

•	Displays and Gages Connector End Views

•	Powertrain Control Module Connector End Views

•	Engine Control Module Connector End Views for the 5.3L engine

•	Engine Control Module Connector End Views for the 6.0L engine

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the ECM/PCM. Install a signal generator and instrument panel tester between the engine speed signal circuit and ground.
Ignition ON, set the signal generator to generate a tachometer signal. Verify that the tachometer indicates a RPM reading.

⇒	If no RPM reading is present, test the signal circuit for an open/high resistance, a short to voltage, or a short to ground. If the circuit tests normal, replace the IPC.

If all circuits test normal, test or replace the ECM/PCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the ECM/PCM and IPC replacement, setup, and programming