Code 4, 8 0R 9: TDC/CYL/Crank Sensor
- Turn ignition off. Remove BACK UP fuse from under hood fuse/relay box for 10 seconds to reset ECU. Check ECU for fault codes. See RETRIEVING CODES . If Code 4, 8 or 9 is not present, problem is intermittent. Check for poor connections at ECU and distributor. Test drive vehicle and retest.
- If CHECK ENGINE light is on and indicates Code 4, 8 or 9, turn ignition off. Disconnect 8-pin connector from TDC/CYL/CRANK sensor connector at distributor. Check resistance between terminals of each sensor. See Fig 1
. If resistance is not 350-700 ohms, replace distributor sub-assembly. See INPUT SIGNAL & RESISTANCE TEST TERMINALS
table. If resistance is 350-700 ohms, go to step 4).INPUT SIGNAL & RESISTANCE TEST TERMINALS
Sensor Code ECU Terminals Sensor Terminals CRANK 4 B15 B CRANK 4 B16 F CYL 9 B11 D CYL 9 B12 H TDC 8 B13 C TDC 8 B14 G - Check continuity to body ground on each terminal. If continuity exists, replace distributor sub-assembly. If continuity does not exist, reconnect 8-pin connector. Connect ECU Test Harness (07LAJ-PT3010A ) to ECU connector, leaving ECU disconnected. Check resistance between ECU terminals. See INPUT SIGNAL & RESISTANCE TEST TERMINALS table.
- If resistance is not 350-700 ohms, repair open in faulty circuit. If resistance is 350-700 ohms, check for continuity to body ground on test terminals B11, B13 and B15. If continuity exists on any terminal, repair short circuit. If continuity does not exist, substitute a known good ECU. If symptom/condition goes away, replace original ECU.