Suzuki 2000 Grand Vitara SQ625 Service Manual page 198

STEP
6 Check fuel injector circuit referring to "TABLE B-3"
in this section.
Is it in good condition?
7 Check fuel level sensor referring to "ENGINE AND
EMISSION CONTROL" section.
Is check result satisfactory?
8 Check MAF sensor referring to "ENGINE AND
EMISSION CONTROL" section.
Is check result satisfactory?
9 Check ECT sensor referring to "ENGINE AND
EMISSION CONTROL" section.
Is check result satisfactory?
10 Check HO2S referring to Step 2 of DTC P0154 (DTC
No.26) Diag. Flow Table.
Is check result satisfactory?
ACTION
ENGINE (H25 ENGINE) 6-1-87
YES
Go to Step 7.
Go to Step 8.
Go to Step 9.
Go to Step 10.
Substitute a known-
good ECM (PCM)
and recheck.
NO
Repair or replace.
Faulty fuel level
sensor or its circuit.
Faulty MAF sensor
or its circuit.
Faulty ECT sensor.
Faulty HO2S.