Mercury MerCruiser D2.8L D-Tronic Service Manual page 609

SERVICE MANUAL NUMBER 22
TEST DESCRIPTION
NOTE: Constant voltage may be observed at the very first part and the very last part of the
TP's rotation.
Verify continuity between the following:
Verify supply voltage to TP sensor with the 7 terminal connector unplugged and key ON.
Measure between terminals 2 and 4 of the harness side connector:
Verify the TP sensor potentiometer current flow between terminals 4 and 5 of the sensor with
the 7 terminal connector plugged in and key ON:
With the key OFF and the 7 terminal connector unplugged, verify the TP sensor
potentiometer resistance between terminals 1 and 4 of the sensor connector:
DIAGNOSTIC HELP:
Verify the following:
•
Open or short in the CKT Pin 2, CKT Pin 5 or CKT Pins 1.
•
Improper terminals or pins at the 7 terminal connector or ECM.
•
Defective TP sensor.
•
Defective ECM.
Failure of the TP sensor influences engine performance as follows:
•
Any failure of the TP sensor or circuits (e. g. plausibility between TP sensor and low
idle switch, TP out of operating range, LGS defective, TP voltage supply defective)
will cause the engine to operate at 800 rpm maximum.
90-860074--1 FEBRUARY 2002
ECM 68 PIN CONNECTOR
15
57
55
65
1
CURRENT (VOLTS)
5
CURRENT (VOLTS)
5
CONDITION
TP at Idle Position
TP at WOT Position
7 TERMINAL CONNECTOR
MINIMUM / MAXIMUM MEASUREMENT
MINIMUM / MAXIMUM MEASUREMENT
RESISTANCE (Ohm)
1050
1650
EDI DIAGNOSIS
1
2
4
5
6
MINIMUM / MAXIMUM
MEASUREMENT
± 100
± 100
Page 5E-41