Appendix; Smart Ims Or Sims Diagnostic Steps - Borg Warner Delco Remy 28MT Diagnostic Procedures Manual

Appendix

5-1. Smart IMS or SIMS Diagnostic Steps

The Smart Starter with integrated magnetic switch (IMS) relay and
integrated over crank protection (IOCP) is designed to protect the
vehicle system from multiple system-related failures. The Smart
Starter will accomplish this by not allowing the starter system
to function in detrimental conditions to the starter or electrical
system. To troubleshoot, you must first verify that the vehicle is
equipped with the Smart Starter SIMS relay and integrated OCP.
The SIMS relay is programmed to protect the vehicle from these
failure modes:
• Starter engagement monitor/auto start retry – click no crank or
prolong power
• Running engine lockout – engagement into running engine
• System low/high voltage lockout – over crank and pinion
chatter
• Time limited crank – over crank
• Auto disengage at engine start – extended overrun
• Integrated OCP thermal cutout switch – heat damage from
extended crank
VISUAL DIFFERENCES
STANDARD IMS RELAY
CAUTION – SMART STARTER!
SMART IMS WITH IOCP EQUIPPED
(INTEGRATED OVER CRANK)
PREVENTS CRANKING UNDER
LOW/HIGH VOLTAGE AND HIGH
TEMPERATURE CONDITIONS
When troubleshooting a vehicle system equipped with SIMS/IOCP,
voltage and temperature are critical during diagnosis:
ENGAGEMENT MONITOR/AUTO RETRY – 12-VOLT SYSTEM:
The system will attempt to engage the pinion three times in less
than one second. After three failed attempts, cycle the engine
ignition off/on before making another crank attempt.
LOW VOLTAGE LOCKOUT – 12-VOLT SYSTEM:
Start attempts are not allowed if open circuit voltage is less than
12 volts (equal to 25% of the battery's state of charge). Check
system voltage and charge batteries if this condition is present
before removing starter.
HIGH VOLTAGE LOCKOUT – 12-VOLT SYSTEM:
If starter sees system voltage of greater than 14 volts, the SIMS/
IOCP will lock out, preventing the start attempt. This protects
against high voltage jumpstarts (starter will be locked out if
attempting jumpstarts above 14 volts).
INTEGRATED OVER CRANK PROTECTION – 12-VOLT SYSTEM:
If the starter is continuously cranked and reaches an internal
temperature greater than 150˚C, the OCP switch will open and
abort the start attempt. This allows the starter to cool down and
SIMS RELAY
the OCP to close so that the crank cycle can be performed. Allow
the starter to cool before removing from the vehicle.
When troubleshooting the starting system, verify that there is
suitable voltage at the "S" terminal before removing the starter.
The SIMS unit may be protecting the starting system if voltages
are either high or low, or if over-cranking occurs and the OCP
switch opens due to high temperatures.
CAUTION LABEL
Caution label to
be placed on can of
SIMS unit
S E C T I O N V
Note:
Page 22