AUTOMATIC TRANSMISSION — Troubleshooting (Diagnosis System) AT-17 Diagnostic code 62 (No. 1 solenoid valve circuitry) Check resistance of No. 1 solenoid valve at ECT ECU connector. (See page AT-30) NG OK Substitute another ECT ECU. Remove the oil pan and check resistance of NG Replace No. 1 solenoid valve. No. 1 solenoid valve connector and body ground. Resistance: 11 — 15 Ω OK Check wiring between No. 1 solenoid valve and ECT ECU. Diagnostic code 63 (No. 2 solenoid valve circuitry) Check resistance of No. 2 solenoid valve at NG ECT ECU connector. (See page AT-30) OK Substitute another ECT ECU. Remove the oil pan and check resistance of NG Replace No. 2 solenoid valve. No. 2 solenoid valve connector and body ground. Resistance: 11 — 15 Ω OK Check wiring between No. 2 solenoid valve and ECT ECU. Diagnostic code 64 (Lock-up solenoid valve circuitry) Check resistance of lock-up solenoid valve at NG ECT ECU connector. (See page AT-30) OK Substitute another ECT ECU. Remove the oil pan and check resistance of NG Replace lock-up solenoid valve. lock-up solenoid valve connector and body ground. Resistance: 11 — 15 Ω OK Check wiring between lock-up solenoid valve and ECT ECU.