Suzuki WagonR+ RB310 Service Manual page 2428

STEP
8 Check engine coolant temp. sensor for performance
(See Section 6E).
Is it in good condition?
9 Check intake air temp. sensor for performance
(See Section 6E).
Is it in good condition?
10 Check throttle position sensor for performance (See
Step 4 of DTC P0121 Diag. Flow Table).
Is it in good condition?
11 Check PCV valve for valve clogging
(See Section 6E).
Is it good condition?
Fig. 1 for Step 3
Fig. 4 for Step 5
ACTION
Fig. 2 for Step 4
1. Fuel delivery pipe
2. Fuel feed hose
3. Fuel pressure gauge &
Fig. 5 for Step 5
YES
Go to Step 9.
Go to Step 10.
Go to Step 11.
Substitute a known-
good ECM and
recheck.
Fig. 3 for Step 5
3 way joint
Fig. 6 for Step 6
ENGINE DIAGNOSIS 6-69
NO
Replace engine
coolant temp. sensor.
Replace intake air
temp. sensor.
Replace throttle
position sensor.
Replace PCV valve.