STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E.
FLASH CODE:
41
J1587 CODE:
S21 0 - TOO MANY SRS (MISSING TRS)
NOTE -
This chart is only to be used if:
1)
All basic mechanical checks and physical inspections have been performed with no problem found, and
2)
Diagnosis of DDEC-III was started at step Start-1, pg 3-345.41 and you have now been referred here.
41-1
Resistance Check
Turn ignition off.
Less than or
Go to 41-2.
Disconnect engine harness
equal to 200 ohms.
connector at ECM.
Read resistance between socket
Greater than
Go to 41-3.
T1 and T2 on engine harness
200 ohms or open.
connector.
41-2
Check for Short
Disconnect TRS connector.
Less than or
A short exists between (ckt #110)
Read resistance between sockets
equal to 10,000 ohms
and (ckt #109) or where resistance
T1 and T2 on the engine harness
on any reading
was less than 10,000 ohms.
connector.
Repair short.
Then go to 41-30.
Also read resistance between
socket T1 and ground, then
Greater than
Go to 41-4.
between socket T2 and ground.
10,000 ohms or open
on all readings.
41-3
Open TRS Line Check
Disconnect TRS connector and
Less than or
Go to 41-4.
install a jumper wire between
equal to 5 ohms.
sockets A and B of the TRS
harness connector.
Greater than
Signal line (ckt #110) or return
Read resistance between sockets
5 ohms or open.
and (ckt #109) is open. Repair
T1 and T2 on the engine harness
open. Then go to 41-30.
connector.
41-4
Check TRS Resistance
Read resistance of TRS across
Less than
Go to 41-12.
sensor connector pins A and B.
100 ohms.
From 100 to
Go to 41-5.
200 ohms.
Greater than
Go to 41-12.
200 ohms.
Change 3 3-345.313
