Silvercrest SKAS 1000 A16 Specifications Page 38

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Section 2
Fault Code Diagnostics
29
21 15 Short circuit to ground at the output
stage to fast engagement clutch valve
Measure the resistance between pin 8 and pin 17 of
clutch actuator connector.
Nominal value should be 14-16 ohms.
If resistance is < 14 ohms, exchange clutch actuator.
If resistance is within correct range, exchange TCU top
assembly.
22 16 Short circuit to ground at the output ACC
(power conversion enable signal for
ZMTEC and continuation signal voltage
doubler and voltage supply to output
speed sensor #2)
Complete the electrical requirements flowchart.
Contact OnTrac at 866-668-7221 and request a
ZF-FreedomLine transmission specialist.
25 19 Short circuit to ground at output SD to
display
NOTE: The display will read “EE.
Troubleshoot the ZF-FreedomLine transmission wiring
harness. Pin 9 of the TCU connector (J1) and pin F2 of
the ZMTEC connector (J3) should all have continuity
(resistance of 0.0 to 0.5 ohms) and not be shorted to any
other circuit. If a short or open circuit is found, replace
the wiring harness. If not, replace the ZMTEC. Should
the ZMTEC not resolve the issue, then replace the TCU
top half.
26 1A The main TCU has not received expected
communications from the engine (CAN
engine configuration timeout)
Due to an issue with the vehicle’s SAE J1939 data link,
the TCU did not receive an expected SAE J1939
message. Follow your OEM’s SAE J1939 diagnostic
procedures to correct the issue.
27 1B The main TCU has not received expected
communications from the engine (error
on engine configuration message
(engine configuration))
The TCU received the SAE J1939 message from the
ECM, but the information within the message was not
within specifications. Verify that the ECM software level
is approved with the ZF-FreedomLine transmission and
that all settings are correct.
If necessary, contact OnTrac at 866-668-7221 and request
a ZF-FreedomLine transmission specialist.
31 1F The main TCU has not received expected
communications from the engine (error
on actual engine retarder-percent torque
message ERC1_ER)
The TCU received the SAE J1939 message from the
engine retarder, but the information within the message
was not within specifications. Verify that the ECM
software level is approved with the ZF-FreedomLine
transmission and that all settings are correct.
If necessary, contact OnTrac at 866-668-7221 and request
a ZF-FreedomLine transmission specialist.
32 20 The main TCU has not received expected
communications from the engine (error
on engine retarder configuration
message (engine retarder configuration))
The TCU received the SAE J1939 message from the
engine retarder, but the information within the message
was not within specifications. Verify that the ECM
software level is approved with the ZF-FreedomLine
transmission and that all settings are correct.
If necessary, contact OnTrac at 866-668-7221 and request
a ZF-FreedomLine transmission specialist.
33 21 The main TCU has not received expected
communications from the engine (CAN
engine retarder configuration timeout)
Due to an issue with the vehicle’s SAE J1939 data link,
the TCU did not receive an expected SAE J1939
message. Follow your OEM’s SAE J1939 diagnostic
procedures to correct the issue.
ISO Fault Code Diagnostics
NOTE: ISO display codes may not be available on vehicles built prior to January 2006.
ISO Fault
Identifier
ISO Display
Fault Codes
(J587 Display) Fault Description
Repair Instructions
NOTE: The following repair instructions pertain to
active faults only. For information and instructions
about inactive faults, please contact OnTrac at
866-668-7221 and request a transmission
specialist.
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