DTC P0141:00, P0161:00 [MZI-3.7]

id0102d2321900

DTC P0141:00 DTC P0161:00 | P0141:00: HO2S heater (RH) circuit P0161:00: HO2S heater (LH) circuit
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DETECTION CONDITION | • P0141:00 indicates that HO2S (RH) heater circuit. • P0161:00 indicates that HO2S (LH) heater circuit. • During testing the HO2S heaters are checked for open and short circuits and excessive current draw. The test fails when the current draw exceeds the calibrated limit or an open or short circuit is detected.
POSSIBLE CAUSE | • Contaminated HO2S • Water in the wiring harness connector • Corrosion or incorrect wiring harness connections • Open circuit between main relay No.1 terminal D and HO2S (RH/LH) terminal C • Damaged ENG BAR fuse • Short to ground between ENG BAR fuse and HO2S terminal C • P0141:00: ― Short to power supply in wiring harness between HO2S (RH) terminal A and PCM terminal 3N ― Open circuit in wiring harness between the following terminals: • HO2S (RH) terminal A—PCM terminal 3N • HO2S (RH) terminal B—PCM terminal 3Z • HO2S (RH) terminal D—PCM terminal 2G ― Short to ground in wiring harness between HO2S (RH) terminal A and PCM terminal 3N • P0161:00: ― Short to power supply in wiring harness between HO2S (LH) terminal A and PCM terminal 3AM ― Open circuit in wiring harness between the following terminals: • HO2S (LH) terminal A—PCM terminal 3AM • HO2S (LH) terminal B—PCM terminal 3AB • HO2S (LH) terminal D—PCM terminal 2G ― Short to ground in wiring harness between HO2S (LH) terminal A and PCM terminal 3AM • HO2S heater control signal circuit short to other wiring harness • HO2S heater malfunction • Low battery voltage • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT FOR SOURCE OF POTENTIAL HO2S CONTAMINATION • Investigate the following items as potential sources of HO2S contamination: ― Use of unapproved silicon sealers ― Fuel contaminated by silicon additives ― Excessive oil consumption ― Glycol leaking internally in the engine ― Lead-contaminated fuel ― Short drive cycles in cold weather ― Use of unapproved cleaning agents • Is a concern present? | Yes | Repair the source of the contamination. Change the engine oil and oil filter. Then go to Step12.
No | Go to the next step.
4 | VISUALLY INSPECT HO2S WIRING HARNESS • Connect the PCM connector. • Visually inspect the HO2S wiring harness for exposed wiring water contamination, corrosion, and proper assembly. • Is a concern present? | Yes | Repair or replace suspected part, then go to Step 12.
No | Go to the next step.
5 | INSPECT HO2S AND SIGNAL RETURN CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS • Turn the ignition switch off. • Disconnect suspect HO2S and PCM connectors. • Measure the resistance between the following terminals (wiring harness-side): ― P0141:00: • HO2S (RH) terminal B—PCM terminal 3Z • HO2S (RH) terminal D—PCM terminal 2G ― P0161:00: • HO2S (LH) terminal B—PCM terminal 3AB • HO2S (LH) terminal D—PCM terminal 2G • Is the resistance less than 5.0 ohms? | Yes | Go to the next step.
No | Repair or replace suspected part, Go to Step 12.
6 | PERFORM KOEO SELF-TEST • Reconnect suspect HO2S and PCM connectors. • Perform the KOEO self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Are DTCs P0141:00, or P0161:00 present? | Yes | Go to the next step.
No | Go to Step 8.
7 | INSPECT POWER SUPPLY IN WIRING HARNESS • Turn the ignition switch off. • Disconnect suspect HO2S and PCM connectors. • Turn the ignition switch to the ON position (engine off). • Measure the voltage between suspect HO2S connector terminal C and ground, on the wiring harness side. • Is the voltage more than 10 V? | Yes | Go to the next step.
No | Inspect the ENG BAR fuse. • If the is fuse deterioration, replace the fuse. • If the fuse has melted, repair for short to ground and replace the fuse. • If the fuse is normal, repair for an open circuit. Go to Step 12.
8 | INSPECT HO2S HEATER FOR SHORT IN WIRING HARNESS • Turn the ignition switch off. • Disconnect suspect HO2S and PCM connectors. • Measure the resistance between HO2S wiring harness-side connector terminal A and the following terminals: ― HO2S wiring harness-side connector terminal C ― HO2S wiring harness-side connector terminal B ― HO2S wiring harness-side connector terminal D • Are the resistances more than 10 kilohms? | Yes | Go to the next step.
No | Repair or replace suspected part, Go to Step 12.
9 | INSPECT HO2S HEATER CIRCUIT FOR OPEN IN HARNESS • Suspect HO2S and PCM connectors are disconnected. • Measure the resistance between the following terminals (wiring harness-side): ― P0141:00: • HO2S (RH) terminal A—PCM terminal 3N ― P0161:00: • HO2S (LH) terminal A—PCM terminal 3AM • Are the resistances less than 5 ohms? | Yes | Go to the next step.
No | Repair for open circuit. Go to Step 12.
10 | INSPECT INTERNAL RESISTANCE OF HO2S HEATER • Suspect HO2S and PCM connectors are disconnected. • Measure the resistance between the suspect HO2S terminal A and C, on the component side. • Is the resistance between 2—50 ohms? | Yes | Go to the next step. (The system is normal at this time. The concern may have been caused by a loose or corroded connector.)
No | Replace HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZI-3.7].) Go to Step 12.
11 | INSPECT HO2S HEATER FOR SHORT TO GROUND • Suspect HO2S and PCM connectors are disconnected. • Measure the resistance between HO2S terminal A on the wiring harness side and body ground. • Is the resistance more than 10 kilohms? | Yes | Go to the next step.
No | Repair or replace suspected part, Go to the next step.
12 | VERIFY TROUBLESHOOTING OF DTCs P0141:00, P0161:00 HAS BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Is the PENDING CODE for this DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
13 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.