Mercury MerCruiser MIE 7.4L MPI User Manual

SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
90-861326--1 MARCH 1999 Page 5F-25
Code 21 (3 of 3): Throttle Position (TP) Sensor Circuit (Scan)
7
Connect DVOM between throttle position sen-
sor terminals “B” and “A.”
7
Voltage should be greater than 4 volts, is
it?
– Step 11 Step 12
8
Check CKT 417 shorted to voltage, faulty ECM
connection, or faulty ECM.
– – –
9
Throttle position sensor signal (CKT 417)
open, shorted to ground, faulty connection at
ECM, or faulty ECM.
– – –
10
Check for open in CKT 416, faulty ECM con-
nection, or faulty ECM.
– – –
11 Replace throttle position sensor. – – –
12
Open sensor ground CKT 813, faulty ECM
connection, or faulty ECM.
– – –
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Index

Mercury MerCruiser MIE 7.4L MPI Specifications

General

Brand	Mercury
Model	MerCruiser MIE 7.4L MPI
Category	Engine
Language	English