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Page Title:
S21 1 - TOO FEW SRS (MISSING SRS) |
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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:
42
J1587 CODE:
S21 1 - TOO FEW SRS (MISSING SRS)
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
42-1
Resistance Check
Turn ignition off.
Less than or
Go to 42-2.
Disconnect engine harness
equal to 200 ohms.
connector at ECM.
Read resistance between socket
Greater than
Go to 42-3.
S1 and S2 on engine harness
200 ohms or open.
connector.
42-2
Check for Short
Remove ECM (para 7-57).
Disconnect SRS connector.
Less than or
A short exists where resistance
Read resistance between sockets
equal to 10,000 ohms
was less than 10,000 ohms.
S1 and S2 on engine harness
on any reading.
Repair short. Then go to 42-30.
connector.
Also read resistance between
Greater than
Go to 42-4.
socket S1 and ground, then
10,000 ohms or open
between socket S2 and ground.
on all readings.
42-3
Open SRS Line Check
Remove ECM (para 7-57).
Disconnect SRS connector and
Less than or
Go to 42-4.
install a jumper wire between
equal to 5 ohms.
sockets A and B of the SRS
connector.
Greater than
Signal line (ckt #111) or return
Read resistance between sockets
5 ohms or open.
line (ckt #112) is open.
S1 and S2 on the engine harness
Repair open. Then go to 42-30.
connector.
42-4
Check SRS Resistance
Read resistance of SRS across
Less than
Go to 42-12.
sensor pins A and B.
100 ohms.
From 100 to
Go to 42-5.
200 ohms.
Greater than
Go to 42-12.
200 ohms.
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