CHECK FOR INTERMITTENT PROBLEMS CHECK FOR INTERMITTENT PROBLEMS
HINT: A
momentary interruption (open circuit) in the connectors and/or wire
harness between the sensors and ECUs can be detected using the Data List
function of the Techstream. (a) Turn the ignition switch off. (b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON. (d) Turn the Techstream on.
(e)
Follow the directions on the Techstream to display the Data List and
select areas where momentary interruption should be monitored.
HINT:
- A momentary interruption (open circuit) cannot be detected for 3 seconds
after the ignition switch is turned to ON (initial check).
- If Error remains displayed for one of the items on the Techstream, check
for continuity between the ECU and the item for which Error is
displayed.
- If a momentary interruption occurs and Error is displayed on the
Techstream, Error will remain displayed on the Techstream for 1 second
after the circuit returns to normal.
ABS/VSC/TRAC |
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
EFI Communication Open |
EFI communication open detection |
Error or Normal | Error: Momentary interruption detected
Normal: Momentary interruption not detected |
After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". | |
Yaw Rate Open | Yaw rate sensor open detection |
Error or Normal | Error: Momentary interruption detected
Normal: Momentary interruption not detected |
After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". | |
Deceleration Open | Acceleration sensor open detection |
Error or Normal | Error: Momentary interruption detected
Normal: Momentary interruption not detected |
After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". | |
Steering Open | Steering angle sensor open detection |
Error or Normal | Error: Momentary interruption detected
Normal: Momentary interruption not detected |
After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". | |
IG Voltage Value Decreased |
+BS voltage value decrease detection |
Error or Normal | Error: Low voltage detected
Normal: Low voltage not detected |
- After low voltage occurs, if there is no low voltage error for 1 second, it switches from "Error" to "Normal".
- Error: 9.8 V or less
| | IG Voltage Value Increased |
+BS voltage value increase detection |
Error or Normal | Error: High voltage detected
Normal: High voltage not detected |
- After high voltage occurs, if there is no high voltage error for 1 second, it switches from "Error" to "Normal".
- Error: 17.4 V or higher
| (f) While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.
OK: Normal is displayed. HINT: If
the display changes, this indicates that there has been a momentary
interruption (open circuit) in the connector and/or wire harness. In
this case, repair or replace the connectors and/or wire harnesses as one
of them is faulty. |
