NO.3 DIESEL PARTICULATE FILTER INDICATOR LIGHT ILLUMINATES FREQUENTLY [MZR-CD 2.2]

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DIESEL PARTICULATE FILTER INDICATOR LIGHT ILLUMINATES FREQUENTLY

DESCRIPTION

•  Diesel particulate filter indicator light illuminates frequently because the diesel particulate filter system can not dispose of diesel particulates

POSSIBLE CAUSE

•  Driving conditions are not in diesel particulate filter regeneration condition

•  Diesel particulate filter is not regenerated by manual regeneration procedure

•  Diesel particulate filter is damaged or deteriorated

•  Erratic signal input to PCM

―  Exhaust gas pressure sensor signal

―  Exhaust system restriction or clogging

3	DIESEL PARTICULATE FILTER INDICATOR LIGHT ILLUMINATES FREQUENTLY
DESCRIPTION	• Diesel particulate filter indicator light illuminates frequently because the diesel particulate filter system can not dispose of diesel particulates
POSSIBLE CAUSE	• Driving conditions are not in diesel particulate filter regeneration condition • Diesel particulate filter is not regenerated by manual regeneration procedure • Diesel particulate filter is damaged or deteriorated • Erratic signal input to PCM ― Exhaust gas pressure sensor signal ― Exhaust system restriction or clogging

Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	Note • When the diesel particulate filter indicator light illuminates frequency, it explains using owner’s manual to the customer the cause the running condition even if the procedure is executed. Connect the M-MDS to the DLC-2. Switch the ignition to ON. Retrieve any DTCs. Are any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [MZR-CD 2.2].) Communication error message is displayed: Inspect the following: • Open circuit between main relay and PCM terminal 2C or 2F • Open circuit main relay and PCM terminal 2I • Main relay stuck open • Open or poor ground circuit (PCM terminal 2B, 2E, 2A or 2D) • Poor connection to vehicle body ground
1		No	No DTC is displayed: Go to the next step.
2	Inspect the exhaust system for restriction and clogging. Is there any restriction or clogging detected?	Yes	Repair or replace suspect part.
2		No	Go to the next step.
3	Perform the following; • Fuel injector injection amount correction (See FUEL INJECTOR INJECTION AMOUNT CORRECTION [MZR-CD 2.2].) • Diesel particulate filter regeneration (See DIESEL PARTICULATE FILTER REGENERATION [MZR-CD 2.2].) • Diesel particulate filter assessment (See DIESEL PARTICULATE FILTER ASSESSMENT [MZR-CD 2.2].)	—	Go to the next step.
4	Inspect the connection of the hose at the exhaust gas pressure sensor. Is the hose connected properly?	Yes	Go to the next step.
4		No	Reconnect the hose properly, then go to the next step.
5	Inspect the engine oil amount. (See ENGINE OIL LEVEL INSPECTION [MZR-CD 2.2].) Is the engine oil amount above the X line on the dipstick?	Yes	Replace the specified engine oil. (See ENGINE OIL REPLACEMENT [MZR-CD 2.2].) Perform the engine oil data reset procedure. (See ENGINE OIL DATA RESET [MZR-CD 2.2].)
5		No	Go to the next step.
6	Does the engine oil data reset procedure each engine oil replacements?	Yes	Troubleshooting completed, go to the next step.
6		No	Perform the engine oil data reset procedure. (See ENGINE OIL DATA RESET [MZR-CD 2.2].)
7	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR-CD 2.2].) • If the malfunction remains, inspect the related Service Information and perform repair or diagnosis. ― If the vehicle is repaired, troubleshooting completed. ― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if later calibration is available. Retest.