327

Possible Causes

• •Intermittent Problem
• •Faulty harness (open circuit)
• •Faulty harness (ground short)
• •Wiring not properly twisted in harness
• •Faulty sensor
• •Faulty ECM
• •Faulty Harness
• •Knock wiring in harness not properly twisted

Suggested Actions

1. 1Perform On-Board (OBD) System Check
2. 2Operate engine at the minimum RPM and MAP defined in diagnostic calibration for the knock sensor open fault to see if DTC 327 resets
3. 3Disconnect knock sensor from wire harness
4. 4Disconnect wire harness header from ECM, remove yellow lock from header at device output terminal, and check resistance between Knock 1 (+) output at ECM header and knock sensor connector (resistance should be <5.0 ohms)
5. 5Check resistance between Knock 1 (+) and ground and 5Vrtn1 (Analog Return) (resistance should be <5.0 ohms)
6. 6Inspect knock wiring in harness to ensure wiring is properly twisted
7. 7Replace faulty sensor and retest
8. 8Replace faulty ECM
9. 9Repair or replace faulty harness
10. 10Operate engine at the minimum RPM and MAP defined in diagnostic calibration for the knock sensor open fault
11. 11Disconnect wire harness header from ECM and carefully remove yellow lock from header at device output terminal
12. 12Check resistance between Knock 1 (+) output at ECM header and knock sensor connector
13. 13Check resistance between Knock 1 (+) and ground and 5Vrtn1 (Analog Return)
14. 14Inspect knock wiring in harness to verify if it is properly twisted
15. 15Replace sensor and retest

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