TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5G-67
Code 44 (3 of 3): Knock Sensor (KS) Circuit (Scan) - No Knock Detected
STEP ACTION VALUE YES NO
PROCEED TO
5. Using a test light connected to battery
positive (B+), repeatedly touch knock sensor
harness terminal (CKT 496).
Does the voltage value change?
– Step14 Step 5
5
1. Disconnect KS module 5-wire harness
connector.
2. Using a test light connected to battery
positive (B+), probe KS module harness termi-
nal “D” (CKT 486).
Does the test light illuminate?
– Step 6 Step 9
6
Using a test light connected to ground, probe
KS module harness terminal “C” (CKT 485).
Does test light illuminate?
– Step 10 Step 13
7
Locate and repair open or short to ground in
CKT 496. If a problem is found, repair as nec-
essary.
Was a problem found?
– Step 11
8
Inspect knock sensor terminal contacts. Also
check for abnormal mechanical engine noises.
If OK, replace faulty knock sensor.
–
Verify
Repair
–
9
Locate and repair open in ground CKT 486.
Is
action complete?
– –
10 Replace faulty KS module.
Is action complete?
– –
11
1. Disconnect both knock sensor electrical
connectors.
2. Using a DVOM, measure the resistance
of each sensor from the sensor terminal to
ground.
Is the resistance of each sensor within the
specified value?
7600 to
8800
Ohms
Step 15 Step 12
12 Replace faulty KS sensor. Is action complete? – –
13 Replace faulty KS module. Is action complete? – –
14
Repair faulty ECM connections or replace
faulty ECM.
Is action complete?
–
Verify
Repair
–
15
DTC 44 is intermittent. Locate and repair inter-
mittent faulty connections. Refer to “Diagnostic
Aids.”
– –
Downloaded from https://needmanual.com/!
To Next Page
Loading...
Need help?
General