Code 4, 9, 54 Or 59: Crank/CYL Sensor
- Turn ignition off. Remove ACG fuse (No. 15, 7.5-amp) in underdash fuse box for 10 seconds to reset ECM. Start engine. Connect jumper wire to self-diagnostic connector. Observe MIL. If Code 4, 9, 54 or 59 is not present, problem is intermittent. Check for poor and loose connections at CRANK/CYL sensor assembly connector and ECM connector. Test drive vehicle and retest.
- If Code 4, 9, 54 or 59 is present, turn ignition off. Disconnect 8-pin connector from CRANK/CYL sensor. Check wiring harness and terminals. Check resistance of each sensor at indicated terminals. See INPUT SIGNAL & RESISTANCE TEST TERMINALS
table. See Fig 1
. If resistance is not 650-900 ohms, replace CRANK/CYL sensor assembly. If resistance is 650-900 ohms, go to step 3.INPUT SIGNAL & RESISTANCE TEST TERMINALS
Sensor Code ECM Terminal Sensor Terminal CRANK 1 4 B15 A B16 B CRANK 2 54 B14 C B13 D CYL 1 9 B12 G B11 H CYL 2 59 B9 E B10 F - Check continuity to body ground on each terminal. If continuity exists, replace CRANK/CYL sensor assembly. If continuity does not exist, reconnect 8-pin connector. Connect ECM Test Harness (07LAJ-PT3010A ) to ECM harness connectors, leaving ECM disconnected. Check resistance between ECM test harness terminals. Refer to the INPUT SIGNAL & RESISTANCE TEST TERMINALS table.
- If resistance is not 650-900 ohms, repair open in faulty circuit. If resistance is 650-900 ohms, check for continuity to body ground on terminals B9, B11, B13 and B15. If continuity exists on any terminal, repair short circuit. If continuity does not exist, replace ECM and retest.