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Page Title:
S21 0 - TOO MANY SRS (MISSING TRS) |
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 TM 9-2320-364-20-1
2-14. DDEC III/IV TROUBLESHOOTING (CONT).
Section IV. TROUBLESHOOTING CHARTS (Cont.)
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/IV was started at step START-1, pg 2-539, and you have now been referred here.
NOTE - ECM must be removed (para 7-57) for access to TRS/SRS connectors.
-
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
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
Remove ECM (para 7-57).
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
Remove ECM (para 7-57).
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
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 pins A and B.
100 ohms.
From 100 to
Go to 41-5.
200 ohms.
Greater than
Go to 41-12.
200 ohms.
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