## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-76

DTC P0141: Secondary HO2S (Sensor 2) Heater Circuit Malfunction

1. Reset the ECM/PCM (see page 11-4).
2. Start the engine.

Is DTC P0141 indicated?

YES | - Go to step 3.
NO | - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the 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 secondary HO2S (Sensor 2) side, measure resistance between the 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 continuity between body ground and the secondary HO2S (Sensor 2) 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 E (31P).