257
M4.8-1055-047
03 Rev. 10/09
ELECTRICAL
Event Code 319
Event Code 319
ACCESS 3 detected the brake switch (BRKS) open-
ing or closing outside the 5-50% brake application
range of the brake sensor (RPS1).
Step 1: Verify brake switch operation in Analyzer menu
A2.3.9.2 is between 18% and 35% when BRKS
changes from 0 to 1 as brake pedal is slowly released
brake pedal and from 1 to 0 as pedal is slowly de-
pressed.
• If: BRKS changes outside range.
– Then adjust BRKS to actuate at approximately
22 to 27%. Recalibrate brake pedal (RPS1) af-
ter brake switch adjustment.
• If: BRKS remains at 0 at 1 regardless of pedal po-
sition.
– Then check condition of BRKS and BRKS cir-
cuit for open or short.
• If: BRKS changes state inconsistently.
– Then replace BRKS.
• If: RPS1 does not change state or is erratic.
– Then proceed to Step 2.
Step 2: Verify linkage and wiring to RPS1 is correct.
• If: Linkage is binding or loose.
– Then repair linkage as needed.
• If: Linkage is correct
– Then proceed to Step 3.
Step 3: Check RPS1 wiring.
• If: RPS1 wiring is not secure.
– Then repair wiring as needed.
• If: RPS1 wiring is secure.
– Then proceed to Step 4.
Step 4: Verify RPS1 5 V power supply (CA606-1 and
-3).
• If: Power supply is available to RPS1.
– Then proceed to Step 6.
• If: Power supply is not available to RPS1.
– Then proceed to Step 5.
Step 5: Check wiring and voltage from ACCESS 3
(CA403-19 and -33).
• If: Power supply is not available from ACCESS 3.
– Then replace ACCESS 3.
• If: Power supply is available from ACCESS 3.
– Then repair wiring from ACCESS 3 (CA403-19
and -33) to RPS1 (CA606-1 and -3).
Step 6: Check RPS1 output voltage, verify RPS1 out-
put ranges from 0.5 to 4.5 Vdc at CA606-3 and -2.
• If: RPS1 output does not range consistently be-
tween approximately 0.5 to 4.5 Vdc.
– Then replace RPS1.
• If: RPS1 output ranges consistently between ap-
proximately 0.5 to 4.5 Vdc.
– Then replace ACCESS 3.
• If: RPS1 wiring input to ACCESS 3 is not correct.
– Then repair wiring to ACCESS 3 as needed.
Figure 15766-01
Crown 2007 PF15665-47 Rev. 10/09
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