DTC P0139:00: Notes

DTC P0139:00 (L3 WITH TC) DETECTION CONDITION & POSSIBLE CAUSES

DTC P0139:00	HO2S circuit slow response
DETECTION CONDITION	The PCM monitors the rich (0.55 V) to lean (0.3 V) response time of the HO2S. The PCM measures the response time when the following conditions are met. The PCM determines a HO2S response deterioration malfunction when the measured response time is more than 0.1 s for 2 of 3 times. MONITORING CONDITIONS Drive Mode 03 (EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode) The following conditions are met: During deceleration fuel cut Estimated temperature of the zirconia element inside the HO2S: above 450°C {842°F} The PCM monitors for a time-out malfunction (when the HO2S remains above 0.2 V for longer than a specified period of time during the fuel cut control). The PCM measures the amount of time from when the following conditions are met until the HO2S output voltage drops below 0.2 V. The PCM determines a HO2S time-out malfunction when the detected time is more than 4 s for 2 of 3 times. MONITORING CONDITIONS Drive Mode 03 (EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode) The following conditions are met: During deceleration fuel cut Estimated temperature of the zirconia element inside the HO2S: above 450°C {842°F} Diagnostic support note This is an intermittent monitor (A/F sensor, HO2S). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	HO2S looseness Exhaust system leakage HO2S malfunction HO2S deterioration High-pressure side fuel delivery system malfunction Fuel pressure sensor (built-in fuel delivery pipe) malfunction Relief valve (built-in fuel delivery pipe) malfunction High pressure fuel pump malfunction Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction Low-pressure side fuel delivery system malfunction Fuel pressure regulator (built-in fuel pump unit) malfunction Fuel pump unit malfunction Fuel filter (built-in fuel pump unit) clogged or restricted Fuel leakage on fuel line from high pressure fuel pump to fuel pump unit Purge solenoid valve malfunction Improper connection of purge solenoid hoses Engine internal malfunction Engine coolant leakage into combustion chamber Insufficient engine compression PCM malfunction

DTC P0139:00

HO2S circuit slow response

DETECTION CONDITION

The PCM monitors the rich (0.55 V) to lean (0.3 V) response time of the HO2S. The PCM measures the response time when the following conditions are met. The PCM determines a HO2S response deterioration malfunction when the measured response time is more than 0.1 s for 2 of 3 times.
MONITORING CONDITIONS
- Drive Mode 03 (EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode)
- The following conditions are met:
- During deceleration fuel cut
- Estimated temperature of the zirconia element inside the HO2S: above 450°C {842°F}
The PCM monitors for a time-out malfunction (when the HO2S remains above 0.2 V for longer than a specified period of time during the fuel cut control). The PCM measures the amount of time from when the following conditions are met until the HO2S output voltage drops below 0.2 V. The PCM determines a HO2S time-out malfunction when the detected time is more than 4 s for 2 of 3 times.
MONITORING CONDITIONS
- Drive Mode 03 (EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode)
- The following conditions are met:
- During deceleration fuel cut
- Estimated temperature of the zirconia element inside the HO2S: above 450°C {842°F}

Diagnostic support note

This is an intermittent monitor (A/F sensor, HO2S).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

HO2S looseness
Exhaust system leakage
HO2S malfunction
- HO2S deterioration
High-pressure side fuel delivery system malfunction
- Fuel pressure sensor (built-in fuel delivery pipe) malfunction
- Relief valve (built-in fuel delivery pipe) malfunction
- High pressure fuel pump malfunction
- Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction
Low-pressure side fuel delivery system malfunction
- Fuel pressure regulator (built-in fuel pump unit) malfunction
- Fuel pump unit malfunction
- Fuel filter (built-in fuel pump unit) clogged or restricted
- Fuel leakage on fuel line from high pressure fuel pump to fuel pump unit
Purge solenoid valve malfunction
Improper connection of purge solenoid hoses
Engine internal malfunction
- Engine coolant leakage into combustion chamber
- Insufficient engine compression
PCM malfunction