Precaution In Diagnosing Trouble - Suzuki Grand Vitara XL-7 Service Manual

PRECAUTION IN DIAGNOSING TROUBLE

D Don't disconnect couplers from ECM (PCM), battery cable from battery, ECM (PCM) ground wire harness from
engine or main fuse before confirming diagnostic information (DTC, freeze frame data, etc.) stored in ECM (PCM)
memory.
D Diagnostic information stored in ECM (PCM) memory can be cleared as well as checked by using SUZUKI scan
tool or generic scan tool. Before using scan tool, read its Operator's (Instruction) Manual carefully to have good
understanding as to what functions are available and how to use it.
D Priorities for diagnosing troubles
If troubleshooting priorities for multiple diagnostic code are given in the applicable diagnostic chart, these should
be followed.
If no instructions are given, troubleshoot diagnostic trouble codes according to the following priorities.
(1) Fuel pressure (P1112 for Suzuki mode of Suzuki scan tool/P0230 for generic scan tool)
(2) Diagnostic trouble codes other than listed below
DTC indicated by generic scan tool or Euro mode of
Suzuki scan tool
P0100, P0120, P0170, P0190, P0200, P0220,
P0230, P0235, P0243, P0560, P0903
(3) Diagnostic trouble codes described in above list
D Be sure to read "Precautions for Electrical Circuit Service" in Section 0A before inspection and observe what is
written there.
D ECM (PCM) replacement or substitution
When substituting a known-good ECM, check for following conditions. Neglecting this check may cause damage
to known-good ECM.
– Resistance value of all relays, actuators is as specified respectively.
– MAF sensor is in good condition and none of power circuit of its sensor is shorted to ground.
D ECU code registration
If ECM is replaced after servicing engine and emission control system, register ECU code into ECM by perform-
ing procedure described in "Procedure after ECM Replacement" of Section 8G. Or ECM dose not function as
Immobilizer Control System.
ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM) 6-9
DTC indicated by Suzuki mode of Suzuki scan tool
P0100, P0101, P0121, P0604, P1169, P1170,
P0190, P0201, P0202, P0203, P0204, P0221,
P1112, P1138, P0235, P0243, P0245, P0246,
P0560, P0561, P0401, P0402