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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
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 was started at step START-1, pg H-25 and you have now been referred here.
NOTE - ECM must be removed (para 7-29.1) for access to TRS/SRS connectors.
STEP/SEQUENCE
RESULT
42-1
Resistance Check
l Turn ignition off.
l Disconnect engine harness
connector at ECM.
l Read resistance between socket
S1 and S2 on engine harness
connector.
42-2
Check for Short
l Disconnect SRS connector.
l Read resistance between sockets
S1 and S2 on engine harness
connector.
l Also read resistance between
socket S1 and ground, then
between socket S2 and ground.
42-3
Open SRS Line Check
l Disconnect SRS connector and
install a jumper wire between
sockets A and B of the SRS
connector.
l Read resistance between sockets
S1 and S2 on the engine harness
connector.
42-4
Check SRS Resistance
l Read resistance of SRS across
sensor pins A and B.
Less than or
equal to 200 ohms.
Greater than
200 ohms or open.
Less than or
equal to 10,000 ohms
on any reading.
Greater than
10,000 ohms or open
on all readings.
Less than or
equal to 5 ohms.
Greater than
5, ohms or open.
Less than
100 ohms.
From 100 to
200 ohms.
Greater than
200 ohms.
WHAT TO DO NEXT
Go to 42-2.
Go to 42-3.
A short exists where resistance
was less than 10,000 ohms.
Repair short. Then go to 42-30.
Go to 42-4.
Go to 42-4.
Signal line (ckt #111) or return
line (ckt #112) is open.
Repair open. Then go to 42-30.
Go to 42-12.
Go to 42-5.
Go to 42-12.
H-201
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