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Home >> Mazda >> 2006 >> 6 s, 4D Wagon, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Symptom Troubleshooting [Engine Control System L3 With TC)) >> No. 9 Fast Idle/Runs On >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different variant/trim than selected.
DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 Connect the WDS or equivalent to the DLC.
Access the ECT PID.
Start and warm-up engine to normal operating temperature.
Is ECT PID reading between 82-112°C {180-234°F}? 		 Yes Go to the next step.
No ECT PID is higher than 112°C {234°F}: 
Go to symptom troubleshooting "NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING ".
ECT PID is less than 82 C {180°F} 
Go to symptom troubleshooting "NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD ".
2 Perform the self-test function using the WDS or equivalent.
Turn the ignition switch to the ON position.
Retrieve any DTCs.
Is a DTC displayed?		 Yes DTC Is displayed: 
Go to the appropriate DTC test.
(See DTC TABLE ).
No No DTC is displayed:
Go to the next step.
3 Inspect for leakage in intake-air system.
Is there any leakage found?		 Yes Repair or replace for leakage.
No Go to the next step.
4 Perform the TP sweep inspection.
(See THROTTLE POSITION (TP) SWEEP INSPECTION ).
Does the electronic throttle control system work properly?		 Yes Visually inspect the throttle body (damaged/scratching). If normal, go to the next step.
No Inspect or replace the malfunctioning parts, according to the inspection results.
5 Connect the WDS or equivalent to the DLC-2.
Access and monitor the following PIDs using the data monitor function.
  • ECT
  • APP
  • ACSW
  • CPP (PCM terminal 1H)
  • PNP (PCM terminal 1W)
  • PSP (PCM terminal 1Z)

Do the PIDs indicate the correct values under trouble condition?
(See USING THE WDS OR EQUIVALENT ).		 Yes Go to the next step.
No Inspect and repair or replace suspected parts and the related harnesses.
If the malfunction remains, perform the intermittent concern troubleshooting.
(See INTERMITTENT CONCERN TROUBLESHOOTING ).
6 Inspect the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP INSPECTION ).
Is the high pressure fuel pump normal?		 Yes Go to the next step.
No Replace the high pressure fuel pump.
7 Inspect the fuel injector for each cylinder.
(See FUEL INJECTOR INSPECTION ).
Are fuel injectors normal?		 Yes Go to the next step.
No Replace the suspected fuel injector.
(See FUEL INJECTOR REMOVAL/INSTALLATION ).
8 Inspect the operation of cruise control system.
Does the cruise control system work properly?		 Yes Inspect and repair or replace the injector driver module or related circuit.
No Repair or replace the malfunctioning part according to inspection results.
9 Verify test results.
  • If normal, return to the diagnostic index to service any additional symptoms.
  • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis.
    • If the vehicle is repaired, troubleshooting is completed.
    • If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.
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