Code 4 - Crank Angle Sensor
- Turn ignition off. Remove HAZARD fuse in main fuse box for 10 seconds to reset ECU. Start engine. Verify if CHECK ENGINE light is on and if LED is flashing Code 4. If LED is flashing Code 4, go to next step. If LED is not flashing Code 4, problem is intermittent. Check connectors at distributor and related circuits.
- Turn ignition off. Disconnect 6-wire TDC/CRANK sensor connector at distributor. Measure resistance between terminals "D" and "E". See Fig 1
. If resistance is not 350-550 ohms, replace distributor assembly. If resistance is within specification, check for continuity between ground and terminals "D" and "E". If continuity exists, sensor is shorted to ground. Replace distributor assembly.
- If continuity to ground did not exist in step 2), reconnect 6-wire connector. Connect ECU Test Harness to main wire harness connector side only. See Figure
. Measure resistance between terminals C1 and C2. If resistance is not 350-550 ohms, repair Orange and/or White wires.
- If resistance is within specification, check for continuity between terminal C1 and ground. If continuity exists, repair short in Orange wire between ECU terminal C1 and distributor connector. If continuity did not exist, substitute a known good ECU and recheck. If condition is corrected, replace original ECU.
Courtesy of AMERICAN HONDA MOTOR CO., INC.