Mercury MerCruiser MCM 454 Mag MPI Service Manual page 722

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