Suzuki GRAND VITARA XL-7 Owner's Manual page 442

TROUBLESHOOTING
Step
1 Was "A/T DIAGNOSTIC FLOW TABLE" in this
section performed?
2 Output shaft speed sensor circuit check :
1) Remove PCM cover.
2) With ignition switch OFF, disconnect PCM
connectors.
3) Check for proper connection to output
speed sensor at C51-1-22 and C51-1-23
terminals.
4) If OK, check resistance of sensor circuit.
Resistance between C51-1-22 and C51-1-23 :
387 – 473 Ω Ω Ω Ω (at 20 °C (68 °F))
Resistance between C51-1-22/C51-1-23 and
ground :
1 MΩ Ω Ω Ω or more
Are check results satisfactory?
3 Output shaft speed sensor check :
1) With ignition switch OFF, disconnect output
shaft speed sensor connector.
2) Check for proper connection to output shaft
speed sensor at each terminals.
3) If OK, then check resistance of output shaft
speed sensor.
Are measured values as specified in Step 2?
4 Check visually output shaft speed sensor and
sensor rotor for the followings.
• No damage
• No foreign material attached
• Correct installation
Are they in good condition?
REFERENCE
Action
Connect oscilloscope between C51-1-23 (+) and C51-1-22 (–) of
PCM connector connected to PCM and check output speed sen-
sor signal.
[A] : Oscilloscope waveforms at about 40 km/h (25 mile/h)
AUTOMATIC TRANSMISSION (4 A/T) 7B1-33
Yes
Go to Step 2.
Go to Step 4.
"ORN" or "WHT" wire
open or shorted to
ground.
Intermittent trouble or
faulty PCM.
Check for intermittent
referring to "INTERMIT-
TENT AND POOR CON-
NECTION" in Section 0A.
No
Go to "A/T DIAGNOSTIC
FLOW TABLE" in this sec-
tion.
Go to Step 3.
Replace output shaft
speed sensor.
Clean, repair or replace.