Suzuki GRAND VITARA XL-7 Owner's Manual page 388

Step
7 CMP Sensor Check
1) Check CMP sensor.
Refer to Step 6 or 7 of "DTC P0340 DIAG.
FLOW TABLE" in Section 6-1.
Is check result satisfactory?
8 Ignition Timing Check
1) Check initial ignition timing and ignition tim-
ing advance, referring to "IGNITION TIM-
ING CHECK AND ADJUSTMENT" in this
section.
Is check result satisfactory?
Action
REFERENCE
Oscilloscope waveforms of CMP sensor REF signal and No.1
ignition trigger signal are as shown in figure when connecting
oscilloscope between terminal C51-1-13 of ECM (PCM) connec-
tor connected to ECM (PCM) and ground, and between terminal
C51-2-28 and ground.
1. REF signal of CMP sensor
2. No.1 ignition trigger signal
3. Primary coil current flow time
IGNITION SYSTEM (FOR H27 ENGINE) 6F2-5
Yes
Substitute a known-good
ECM (or PCM) and then
repeat Step 2.
System is in good condi-
tion.
No
Tighten CMP sensor bolt
or replace CMP sensor.
Adjust ignition timing or
check ECM (PCM) input
signals related to this sys-
tem.