DTC P2097:00, P2099:00 [MZI-3.7]

id0102d2922400

DTC P2097:00

DTC P2099:00

Post catalyst fuel trim system too rich (RH)

Post catalyst fuel trim system too rich (LH)

DETECTION CONDITION

•  P2097:00 indicates that post catalyst fuel trim system too rich (RH)

•  P2099:00 indicates that post catalyst fuel trim system too rich (LH)

•  The PCM monitors the correction value from HO2S as part of the fore-aft oxygen sensor control routine. The test fails when the fuel decrease correction value is greater than the calibrated limit.

POSSIBLE CAUSE

•  A/F sensor connector or terminal malfunction

•  HO2S connector or terminal malfunction

•  Contaminated A/F sensor and/or HO2S

•  PCM malfunction

DTC P2097:00 DTC P2099:00	Post catalyst fuel trim system too rich (RH) Post catalyst fuel trim system too rich (LH)
DETECTION CONDITION	• P2097:00 indicates that post catalyst fuel trim system too rich (RH) • P2099:00 indicates that post catalyst fuel trim system too rich (LH) • The PCM monitors the correction value from HO2S as part of the fore-aft oxygen sensor control routine. The test fails when the fuel decrease correction value is greater than the calibrated limit.
POSSIBLE CAUSE	• A/F sensor connector or terminal malfunction • HO2S connector or terminal malfunction • Contaminated A/F sensor and/or HO2S • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		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.
2		No	Go to the next step.
3	VISUALLY INSPECT A/F SENSOR AND HO2S CONNECTORS • Turn the ignition switch off. • Disconnect A/F sensor and HO2S connector for suspect bank. • Visually inspect for a loose connection, and damaged or corroded terminals • Is a concern present?	Yes	Repair or replace suspect part then go to Step 5.
3		No	Go to the next step.
4	INSPECT FOR POTENTIAL SENSOR CONTAMINATION CONCERNS • Investigate the following items as potential sources of A/F sensor 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 or replace the source of the contamination. Replace the engine oil and oil filter. Go to the next step.
4		No	Go to the next step. (The system is operating normally at this time. The concern may have been caused by a loose or corroded connector.).
5	VERIFY TROUBLESHOOTING OF DTC P2097:00, P2099:00 HAVE BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Perform the OBD DRIVE MODE up to Misfire, Fuel and HO2S Monitors (Step 11). (See OBD DRIVE MODE [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.
5		No	Go to the next step.
6	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].)
6		No	Troubleshooting completed.