DTC P2097: Notes

DTC P2097 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

DTC P2097	Target A/F feedback system too rich
DETECTION CONDITION	TYPE A The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is less than specification, for 35.2 s the PCM determines that the target A/F feedback system is too rich. MENTORING CONDITIONS HO2S feedback fuel control is active. Engine speed is 1,500 rpm or more. Engine coolant temperature is above 70°C {158 °F}. HO2S heater is ON. Intake air volume is above 4g/s {0.5 lb/min}. TYPE B The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is less than specification, the PCM determines that the target A/F feedback system is too rich. Diagnostic support note This is a continuous monitor. (Fuel system) 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 the first drive cycle. FREEZE FRAME DATA (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Leakage exhaust gas HO2S malfunction IAT sensor malfunction Erratic signal to PCM ECT sensor MAF sensor TP sensor Related connector or terminal malfunction Related wiring harness malfunction A/F sensor malfunction Excessive fuel line pressure Fuel pump malfunction Pressure regulator (built-in fuel pump unit) malfunction Purge valve malfunction Improper operation ignition system Ignition coil malfunction Spark plug malfunction Ignition coil related wiring harness malfunction Improper operation of fuel injector Fuel injector malfunction Fuel injector related wiring harness malfunction Insufficient engine compression ECT sensor malfunction PCM malfunction

DTC P2097

Target A/F feedback system too rich

DETECTION CONDITION

TYPE A

The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is less than specification, for 35.2 s the PCM determines that the target A/F feedback system is too rich.

MENTORING CONDITIONS

HO2S feedback fuel control is active.
Engine speed is 1,500 rpm or more.
Engine coolant temperature is above 70°C {158 °F}.
HO2S heater is ON.
Intake air volume is above 4g/s {0.5 lb/min}.

TYPE B

The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is less than specification, the PCM determines that the target A/F feedback system is too rich.

Diagnostic support note

This is a continuous monitor. (Fuel system)
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 the first drive cycle.
FREEZE FRAME DATA (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Leakage exhaust gas
HO2S malfunction
IAT sensor malfunction
Erratic signal to PCM
- ECT sensor
- MAF sensor
- TP sensor
- Related connector or terminal malfunction
- Related wiring harness malfunction
A/F sensor malfunction
Excessive fuel line pressure
- Fuel pump malfunction
- Pressure regulator (built-in fuel pump unit) malfunction
Purge valve malfunction
Improper operation ignition system
- Ignition coil malfunction
- Spark plug malfunction
- Ignition coil related wiring harness malfunction
Improper operation of fuel injector
- Fuel injector malfunction
- Fuel injector related wiring harness malfunction
Insufficient engine compression
ECT sensor malfunction
PCM malfunction