Suzuki Grand Vitara 2011 Manual page 189

Step
7 MAF sensor for performance check
1) With ignition switch turned OFF, connect scan tool to
DLC.
2) Start engine and warm up to normal operating
temperature.
3) Check MAF value using scan tool (Refer to "Scan Tool
Data: For Petrol Engine Model" for normal value.).
Is each value within specified range?
8 ECT sensor for performance check
1) Check ECT sensor performance referring to Step 2 to 4
and 11 of "DTC P0116: Engine Coolant Temperature
Circuit Range / Performance: For Petrol Engine Model".
Is check result satisfactory?
9 Engine type check
Is engine type J20A?
10 A/F sensor adjusting resistor power /ground circuit
check
1) Disconnect connector from A/F sensor with ignition
switch turned OFF.
2) Check for proper connection to A/F sensor connector.
3) If connections are OK, check A/F sensor adjusting
resistor circuit for the following.
• ECM 5 V power is applied to A/F sensor adjusting
resistor circuit at A/F sensor connector (power circuit
check)
• Resistance between ground to ECM for A/F sensor
adjusting resistor circuit and vehicle body ground is
less than 1 Ω at A/F sensor connector (ground circuit
check)
Is it in good condition?
11 A/F sensor adjusting resistor circuit check
1) Disconnect connector from ECM with ignition switch
turned OFF.
2) Check for proper connection of each A/F sensor circuit
terminal to ECM connector.
3) If connections are OK, check A/F sensor adjusting
resistor circuit for the following.
• Resistance of each A/F sensor adjusting resistor
circuit wire between A/F sensor connector and ECM
connector is less than 3 Ω (continuity check)
• Resistance between A/F sensor adjusting resistor
circuit wires are infinity (no continuity check)
• Resistance between each A/F sensor adjusting
resistor circuit wire and vehicle body ground is infinity
(ground short check)
• Voltage between each A/F sensor adjusting resistor
circuit wire and vehicle body ground is 0 V with
ignition switch tuned ON (power short check)
Is it in good condition?
Engine General Information and Diagnosis: For Petrol Engine Model 1A-120
Action Yes
Go to Step 8.
Go to Step 9.
Go to Step 10.
Go to Step 12.
Substitute a known
good ECM and recheck.
No
Go to "DTC P0101:
Mass Air Flow Circuit
Range / Performance:
For Petrol Engine
Model".
Faulty ECT sensor or its
circuit.
Go to Step 13.
Go to Step 11.
Repair or replace
defective circuit.