Suzuki GRAND VITARA 2005 Service Manual page 65

Troubleshooting for 1.DEF: Offset at maximum threshold and 2.DEF: Offset at minimum threshold
NOTE
Conditions for applying fault finding procedures to stored faults: The fault is declared present after
ignition switch has been turned OFF for 40 seconds.
Check the MAF sensor assembly with IAT sensor connections.
Check the ECM connections.
Repair if necessary
Check the following connections for continuity and make sure there is no interference resistance:
• Between "C13-5" wire of MAF sensor assembly with IAT sensor connector and "C86-47" terminal of ECM
connector
• Between "C13-6" wire of MAF sensor assembly with IAT sensor connector and "C86-12" terminal of ECM
connector
• Between "C13-2" wire of MAF sensor assembly with IAT sensor connector and "C86-24" terminal of ECM
connector
• Between "C13-4" wire of MAF sensor assembly with IAT sensor connector and "E33-6" terminal of main relay
mounting connector
Repair if necessary.
If the fault is still present, apply fault finding-Tests Test 3 referring to "Test 3: Checking the turbocharged air inlet
circuit: " and Test 4 referring to "Test 4: MAF sensor: ".
• Check that the inlet throttle valve is open
• With the MAF sensor assembly with IAT sensor connected, turn ON ignition switch and engine stopped:
• Check the voltage between "C13-2" and "C13-6" wires of the MAF sensor assembly with IAT sensor
connector:
If the value is not 0.5 – 0.7 V, replace the MAF sensor assembly with IAT sensor.
Check the EGR valve is not jammed open:
• Deal with any faults.
• Apply fault finding-Tests Test 7 referring to "Test 7: Exhaust gas recirculation valve: ".
If these checks show that the valve is jammed or irrevocably seized, replace the EGR valve.
If no faults are revealed, but the fault is still present, replace the MAF sensor assembly with IAT sensor
Engine General Information and Diagnosis: 1A-33