## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-256

DTC 65:Secondary HO2S (Sensor 2) Heater Circuit Malfunction NOTE: Information marked with an asterisk (*) applies to D15Y4, D17A2 (KU, KQ, KZ, FO models), D17Z1 (KQ model) engines.

1. Reset the ECM/PCM (see page 11-167).
2. Start the engine.

Is the MIL on and does it indicate DTC 65?

YES | - Go to step 3.
NO | - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at Secondary HO2S (Sensor 2) and at the ECM/PCM.

3. Turn the ignition switch OFF.
4. Disconnect the secondary HO2S (Sensor 2) 4P connector.
5. At the HO2S side, measure resistance between the secondary HO2S 4P connector terminals No. 3 and No. 4.

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

Wire side of female terminals

Is there 10-40 ohms?

YES | - Go to step 6.
NO | - Replace the secondary HO2S (Sensor 2).

6. Check for continuity between body ground and the secondary HO2S 4P connector terminals No. 3 and No. 4 individually.

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

Wire side of female terminals

Is there continuity?

YES | - Replace the Secondary HO2S (Sensor 2).
NO | - Go to step 7.

7. Turn the ignition switch ON (II).
8. Measure voltage between the secondary HO2S 4P connector terminals No. 3 and No. 4.

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

Terminal side of male terminals

Is there battery voltage?

YES | - Go to step 9.
NO | - Go to step 12.

9. Turn the ignition switch OFF.
10. Disconnect ECM/PCM connector A (31P) (ECM/PCM connector E (31P))*.