The PM6 ECU is a common engine control unit found in 1988–1991 Honda Civic and CRX models equipped with the D16A6 engine. This article serves as a technical reference for configuration and diagnostic procedures.

Idle Configuration#

The target idle speed for the PM6 ECU is managed via specific memory addresses within the ECU firmware.

Tip

The procedure for adjusting the target idle on a PM6 ECU is functionally identical to the process used for the PM7 ECU. Refer to the 91 PM7 Target Idle0 documentation for step-by-step instructions.

Diagnostics#

The PM6 ECU features an onboard diagnostic LED located on the ECU casing to assist in identifying system faults.

• Diagnostic LED: The LED flashes to indicate stored Diagnostic Trouble Codes (DTCs).
• Troubleshooting: For a comprehensive guide on interpreting the blinking patterns and identifying specific engine faults, refer to the 91 PM6 ECU LED CEL0 documentation.

Related Documentation#

• 91 PM6 Target Idle0
• 91 PM6 ECU LED CEL0
• ECU Overview0